Answer: A. the succession of community is completed
Explanation:
GeoPanther ur answer is wrong, just retook my test and C was wrong, it showed me the correct answer
A climax community is indicated by the stabilization of a community's population and composition, which remains unless a significant disturbance occurs, resulting in the final stage of ecological succession.
Explanation:Scientists recognize that a climax community has been reached when they observe that the population of a community stabilizes and doesn't significantly change in size or scope, indicating the final stage of ecological succession. This means the succession of communities is completed, resulting in a stable balance of all organisms within the ecosystem.
The climax community will remain relatively stable unless a significant disturbance, like a disaster, alters the ecosystem, starting succession anew. It is important to note that what constitutes a climax community can vary greatly depending on the region's climate and geology, such as tropical rainforests in the tropics or coniferous forests in northern areas.
One of the known effects of acid rain is that it leaches calcium carbonate out of the soil. A study in a region that received significant amounts of acid rain showed that birds were laying eggs with highly porous shells. As a result, the bird population was declining. What is the MOST LIKELY cause of the observed quality of egg shells? A) Acid rain leaches out the calcium that is the most significant component of egg shells. B) The birds are unable to get calcium from the soil because the calcium has been leached out by the acid rain. C) The birds are unable to get calcium from the soil because the calcium has been consumed by the snails to secrete their shells. D) Calcium deficiency was caused because snails in the birds’ diets are unable to get enough calcium to secrete their shells.
Answer:
B) The birds are unable to get calcium from the soil because the calcium has been leached out by the acid rain
Explanation;
Calcium is needed by birds in large quantities for the development off the egg shell production and for healthy growth of newborn chicksCalcium cannot be stored in the skeleton of the birds since it would make them too heavy and can easily be attacked by predators.Therefore the birds have to get calcium directly from its source and eat it. Lack of calcium in the soil lead to lack of a source of calcium for the birds thus their eggs might end up failing to hatch due to the small holes on its shell and once there is air in the egg shell no hatching can take place leading to decline in population.
Answer:
I agree, the answer is B
Explanation:
Bacteria and fungi feed on a dead log.These organisms act as decomposers by breaking
down the matter in the log and returning
vital nutrients to the ecosystem.Which of
the following terms describes the role of the bacteria and fungi in the environment?
A.) producer
B.) habitat
C.) niche
D.)community
Answer:B habitat
Explanation:
The majority of triglyceride digestion occurs in the small intestine facilitated by the enzyme __________ ________.
Answer:
The correct answer is PANCREATIC LIPASE.
Explanation:
The three types of food eaten by man are broken down into three different components during digestion. Carbohydrate is broken down to glucose, fat and oil is broken down to fatty acid and glycerol and proteins are broken down to amino acids. Most of these digested products are absorbed at the small intestines.
The presences of triglycerides at the small intestines usually stimulates the secretion of pancreatic lipase enzyme and bile. The bile break down the fat molecule and increase its surface area so that pancreatic lipase will be able to work on it effectively. Thus, triglyceride digestion at the small intestines is facilitated by the enzyme pancreatic lipase.
Triglyceride digestion primarily occurs in the small intestine facilitated by the enzyme pancreatic lipase which breaks them down into two free fatty acids and a monoglyceride. Bile salts also support this process by emulsifying the fats.
Explanation:The majority of triglyceride digestion happens in the small intestine with the aid of the enzyme called pancreatic lipase. This enzyme is produced by the pancreas and released when food arrives in the small intestine. It then breaks down the triglycerides into two free fatty acids and a monoglyceride, which includes both short-chain (less than 10 to 12 carbons) and long-chain fatty acids. Additionally, the bile salts emulsify the fats which further facilitates this digestive process. The digestion of triglycerides is an important part of lipid metabolism.
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People trying to gain weight should eat most of their kilocalories from fat. select one:
a. True
b. False
I think the answer is true
Select all that apply.
Select the true statements about Eubacteria.
A.) Most live as decomposers and heterotrophs.
B.) Most only thrive in a narrow range of environments.
C.) Certain Eubacteria are responsible for food poisoning.
D.) Eubacteria thrive in extreme environments.
The true statements about Eubacteria are:
A.) Most live as decomposers and heterotrophs.
C.) Certain Eubacteria are responsible for food poisoning.
D.) Eubacteria thrive in extreme environments.
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Carol and Joseph have freckles and curly red hair. All of their children, except one, also have freckles and curly red hair. Their son, Sam, has the same curly red hair but not one freckle! How can a child get a chromosome that is totally different from the original chromosomes of both parents? A) gene flow B) genetic drift C) crossing over D) natural selection
Answer:
Crossing Over
Explanation:
The exchange of homologous chromosomes.
Answer:
C) crossing over
Explanation:
A child can get a chromosome that is totally different from the original chromosomes of both parents through crossing over. During crossing over DNA lengths are swapped between chromosomes. This exchange produces a chromosome that has a different composition from the original two chromosomes.
Which condition would disturb the hardy-weinberg equilibrium and cause the gene pool to change?
Mating occurs at random.
No mutations occur.
All genotypes on average produce an equal number of fertile adult offspring.
Several homozygous recessive individuals leave the population.
Answer: Several homozygous recessive individuals leave the population.
which process occurs repeatedly after zygote formation to increase the number of cells
Answer:
Mitosis
Explanation:
A zygote is formed after the fertilization of the egg by sperm. The zygote then undergoes rapid cell division by mitosis to form a morula, blastula, gastrula and then an embryo. In mitosis, the cell replicates its genetic material and organelles and then splits into two identical cells. Mitosis is required for growth and development.
14. In what type of cell would meiosis occur? A. Lung cell B. Brain cell C. Blood cell D. Sex cell
Answer:
I believe it is a sex cell.
Explanation:
The meiosis process occurs in gametes or sex cells. Therefore, option D is correct.
Meiosis is a specialized type of cell division that occurs in organisms that reproduce sexually. It involves the division of a diploid (2n) cell into four haploid (n) cells, resulting in the production of gametes (sex cells) such as sperm and eggs.
Meiosis consists of two successive divisions, known as meiosis I and meiosis II. The process is characterized by specific stages, including prophase I, metaphase I, anaphase I, telophase I, and cytokinesis, followed by prophase II, metaphase II, anaphase II, telophase II, and cytokinesis.
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Name the five nitrogenous bases, and put a checkmark in the correct column for each base. also indicate if the base is found in dna (d), rna (r), or both (b).
Adenine (A), guanine (G), cytosine (C) are found both in DNA and RNA. Thymine (T) is found only in DNA and uracil (U) is found only in RNA.
Explanation:The five nitrogenous bases are adenine (A), guanine (G), cytosine (C), thymine (T), and uracil (U). Adenine and guanine are the purines, and they have a double-ring structure with a six-carbon ring fused to a five-carbon ring. Cytosine, thymine and uracil are the pyrimidines, which have only a six-carbon ring structure.
Adenine - DNA (D), RNA (R), Both (B) Guanine - DNA (D), RNA (R), Both (B) Cytosine - DNA (D), RNA (R), Both (B) Thymine - DNA (D), Not in RNA Uracil - RNA(R), Not in DNA Learn more about Nitrogenous bases here:
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The cell is preparing to split. The cells are going to be equal so I'd say it's the bottom image
Carbon dioxide levels in the blood and cerebrospinal fluid affect blood pH. This enables the organism to sense a disturbance in gas levels as ________. A. the brain directly measures and monitors oxygen levels and causes breathing changes accordingly. B. the brain alters the pH of the cerebrospinal fluid to force the animal to retain more or less carbon dioxide. C. the medulla oblongata, which is in contact with cerebrospinal fluid, monitors pH and uses this measure to control breathing. D. stretch receptors in the lungs cause the medulla oblongata to speed up or slow breathing.
Answer:
C. the medulla oblongata, which is in contact with cerebrospinal fluid, monitors pH and uses this measure to control breathing.
Explanation:
The central chemoreceptors are located near the medulla inside the blood-brain barrier. When CO2 in cerebrospinal fluid increases, pH of the fluid lower (because CO2 becomes hydrated to carbonic acid). Change in pH stimulates the central chemoreceptors to activate respiratory centers which will increase the respiratory rate and depth of breathing.
The medulla oblongata, in contact with cerebrospinal fluid, monitors blood pH and carbon dioxide levels to control breathing, ensuring homeostasis.
Carbon dioxide levels in the blood and cerebrospinal fluid affect the blood pH. This enables the organism to sense a disturbance in gas levels as C. the medulla oblongata, which is in contact with cerebrospinal fluid, monitors pH and uses this measure to control breathing. The medulla oblongata is the part of the brain that detects changes in carbon dioxide levels and pH, triggering the respiratory centers to adjust the rate and depth of breathing. Faster breathing is initiated to decrease high carbon dioxide levels, which also decreases the levels of hydrogen ions, leading to an increase in blood pH. Conversely, slower breathing occurs if there is a low carbon dioxide level, which helps maintain pH levels within a normal range.
What are the conditions required to maintain allele frequency in a population?
Answer:
A large population No change in allelic frequency due to evolutionary mechanisms (mutation, natural selection, gene flow, genetic drift)Random matingExplanation:
According to Hardy-Weinberg Law, allele frequencies of the population will remain constant through the generation if a population is large, without evolutionary mechanisms acting on it (mutation, natural selection, gene flow, genetic drift), if mating is random. In other words, population is equilibrium (Hardy-Weinberg equilibrium).
Allele frequency describes how often an allele appears in a population. This measure is usually expressed in percentage. Allele frequency can describe the variation that exist within the population. It can be calculated as the number of alleles divided with the total number of gene copies in that population.
Change in allele frequencies over a certain short period of time is defined as microevolution. Mechanisms of evolution that can change allele frequencies through time are mutations, natural selection, genetic drift and gene flow (migrations).
Large populations of tortoises inhabited the Galapagos Islands before humans. When humans settled on the islands and introduced goats, the number of tortoises declined. What is most likely the explanation for the decrease in the tortoise population?
Answer:it reached carrying capacity. the environment couldn't hold both the goat and tortises
Explanation:
Over-using an aquifer can lead to subsidence. which other hazard would most likely be exacerbated by this subsidence?
Answer:
the answer is flooding.
Despite the differences in mature plant cells, all of them are derived from meristem cells. The three major types of tissue systems develop from the meristem. Meristems develop cells in all but which tissue? A) notocord B) protoderm C) procambium D) ground meristem
Answer:
A) notocord
Explanation:
Answer:
Notochord
Explanation:
Meristem cells are a group of plant cells capable of division and growth that reside in zones where growth can occur. As undifferentiated cells, they are considered as stem cells in animals given that they are the origin of many of the cells that go on to rapidly differentiate/specialize and form various parts of plant. A collection of meristem cells performing a specific function is called meristem tissue.
Meristems are classified based on their location or position; apical meristem (at the tips), intercalary (in the middle) and lateral (at the sides). Apical meristem is further divided into:
- Protoderm (which differentiates into epidermis)
- Ground meristem ( differentiation gives rise to parenchyma, collenchyma and sclerenchyma)
- Procambium ( differentiation results in the production of vascular tissues of the plant; xylem and phloem)
Notochord is a cartilaginous skeletal rod supporting the body in all embryonic and some chordate animals. Notochords are only found in the phylum Chordata, a group of animals including humans. Hence, notochords is not a structural characteristics of plants and cannot be produced by the meristem cells in plants.
How does pH affect enzyme activity? Use the enzymes pepsin and trypsin as examples.
Answer:
The change in PH not only effect the shape of enzymes, but it may also change properties the of substrate so that that substrate cannot control to bind the active site and it cannot undergo catalysis.
In general enzymes have a PH optimum. However this optimum is not same for each enzyme.
Explanation:
For Example; The enzyme pepsin is most active at an acidic PH, Whereas the enzyme trypsin performs best at slightly alkaline PH. the increase or decrease in PH can change the concentration of ion in a solution
Suppose you have a population of 300 butterflies. If the population experiences a net growth of 12% in the following year, how many butterflies do you have?
Answer:
There are total [tex]336[/tex] butter flies.
Explanation:
Given -
Population [tex]= 300[/tex]
Net growth in population in the next year [tex]= 12[/tex] %
New population [tex]=[/tex] Existing population + (Net growth in population [tex]*[/tex]Existing Population
Substituting the given values in above equation, we get -
New population[tex]= 300 + ( \frac{12}{100} *300)\\= 300 + 36\\= 336\\[/tex]
Hence, there are total [tex]336[/tex] butter flies.
Kathy is a big fan of horror movies. Although she was initially too afraid to watch them alone, she soon found that she could not get enough of them. Kathy began to watch television shows that were more violent as well. Which of the following effects is most likely responsible for Kathy’s behavior? A. aggressor effect B. victim effect C. appetite effect D. hostile expectation bias
Agree with snzzyninja (C.) Appetite effect.
Answer:
appetite effect
Explanation:
Edge
One difference between prokaryotes and eukaryotes is that
Prokaryotes: Single-called with no membrane-bound organelles nor nucleus (bacteria; they have nucleoid).
Eukaryotes: Multicellular with membrane-bound organelles and a nucleus (you and me; we have nucleus)
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Firefly luciferase is the enzyme that allows fireflies to illuminate their abdomens. because this light generation is an atp-requiring reaction, firefly luciferase can be used to test for the presence of atp. in this way, luciferase can test for the presence of life. the coupled reactions are
Answer:
Overall DeltaG = -6.40 kJ/mol
Delta G = 31.6 - 6.4 =25.2 KJ
T = 17 + 273.15 =290.15 K
Delta G = -RT * Ln (K)
25.2 * 10^3 J = -(8.314 J/moles*k)(290.15K) * Ln (K)
So (Delta G)/(-RT) = Ln (K)
Ln K = -10.44643114
Thus k = 2.905 *10^-5
Answer:
Luciferase is an enzyme that belongs to the oxidative enzyme set of some bioluminescence reactions. This phenomenon was discovered by Rafaël Dubois, who detected the emission of light in some living things was nothing more than an enzymatic oxidation, in which luciferase was the catalyst, and luciferin the substrate. This phenomenon was frequently detected in fireflies and in the Pholas dactylus mollusk, and later in Cnidarians (Renilla reniformis), marine copepods (Gaussia princeps), abyssal molluscs (Oplophorus gracilirostris), bacteria, etc.
Explanation:
The biological role of luciferase lies in its quality as a catalyst for some types of bioluminescence. Bioluminescence is a type of chemiluminescence, it consists of the oxidation of luciferin, a luminescent substance, catalyzed by luciferase. Said reaction begins with luciferin whose carboxylic group reacts with the phosphate group of ATP, forming luciferyl adenylate. This molecule is oxidized (a process catalyzed by luciferase), resulting in an intermediate peroxide (luciferase-luciferin-AMP-O2 complex) which, upon releasing a molecule of carbon dioxide, results in a ketoderivative, the oxyluciferin, which is excited, returning to its normal state by releasing a photon of light:
Luciferin + O2 → Peroxidic intermediary (luciferase-luciferin-AMP-O2 complex) → [oxyluciferin] → oxyluciferin → light
A pod of bottlenose dolphins is showing signs of stress in the Gulf of Mexico. Why would it be important for scientists to study the age structure of the pod?
Answer: Age structure would help scientists determine if the problem exists with young or old dolphins. A.
Explanation:
took the test
A gene coding for __________ proteins is likely to be found in a genomic island of a pathogenic bacterial strain and not found in a nonpathogenic strain.
Answer: CAN I GET THE ANSWER CHOICES AND I MAY THINK ITS PATHOGENIC
Explanation:
A gene coding for virulence factors proteins is likely to be found in a genomic island of a pathogenic bacterial strain and not found in a nonpathogenic strain.
Genomic islands are clusters of genes that are present in some strains of a bacterial species but not others. These islands often contain genes that confer an adaptive advantage to the bacteria, such as antibiotic resistance, metabolic capabilities, or pathogenicity. In the context of pathogenic bacterial strains, genomic islands frequently carry genes that encode for virulence factors proteins that enable the bacteria to cause disease in a host organism.
Virulence factors can include a variety of proteins, such as adhesins, which help bacteria attach to host cells; toxins, which can damage host tissues; and enzymes that may help the bacteria evade the host's immune response. The presence of these genes in a pathogenic strain and their absence in a nonpathogenic strain suggests that they play a role in the ability of the pathogenic strain to cause disease.
Therefore, when comparing pathogenic and nonpathogenic strains of bacteria, one would expect to find genes coding for virulence factors in the genomic islands of the pathogenic strain, as these proteins contribute to its ability to infect and harm a host.
Suppose you observed 240 progeny that resulted from a monohybrid cross and involved genes that obeyed Mendelian inheritance, how many heterozygous progeny would you expect to observe?
Answer:
120
Explanation:
If there is a monohybrid cross that involved genes that obeyed Mendelian inheritance this means that parental generation includes two true breed parents (both homozygous but with different genotype).
If we name the gene with A:
P: AA x aa
F1: Aa Aa Aa Aa
F2: AA Aa Aa aa
Half of them will be heterozygous, it means 120.
Which of the following molecules are involved in pattern formation during development?
A) transcription factors
B) cAMP
C) cytoplasmic determinants
D) miRNAs
Answer:
C) cytoplasmic determinants
Explanation:
Cytoplasmic determinants are special molecules which play a very important role during oocyte maturation, in the female's ovary.
Answer:
The correct answer is - C)
Explanation:
Pattern formation is the development process by which cells are move to acquire different fates and identities depending on their positions inside the embryo. Cytoplasmic determinants are the molecules that help in determining in pattern formation during development.
These molecules decides and ensures the organs and tissues develop in the correct place and orientation.
Thus, the correct answer is C)
Given two areas with equal sunlight and available water. Area I has a high amount of atmospheric carbon dioxide while Area II has a low amount of atmospheric carbon dioxide. How does the rate of photosynthesis in Area I compare to that in Area II? Atmospheric carbon dioxide has no effect on the rate of photosynthesis. The rate of photosynthesis increases with a decrease in carbon dioxide. The rate of photosynthesis increases with an increase in carbon dioxide. The level of carbon dioxide increases with the level of available oxygen.
Answer:
b
Explanation:
Which statements about the modification of chromatin structure in eukaryotes are true?
1.DNA is not transcribed when chromatin is packaged tightly in a condensed form
2.Some forms of chromatin modification can be passed on to future generations of cells
3.Acetylation of histone tails in chromatin allows access to DNA for transcription
4.Acetylation of histone tails is a reversible process.
5. Methylation of histone tails in chromatin can promote condensation of the chromatin
6. Deacetylation of histone tails in chromatin loosens the association between nucleosomes and DNA
Answer:
All of the statements are correct except 6. (Deacetylation of histone tails in chromatin loosens the association between nucleosomes and DNA)
Explanation:
Chromatin structure and its modifications can change the package of the DNA and consequently, alter the gene expression. The most common modifications of the chromatin are covalent modifications such as acetylation/deacetylation (by acetyltransferases and eacetylases), methylation (by methyltransferases), and phosphorylation (by kinases). This is the way of gene expression regulation.
The effects of modifications are different, for example methylation promotes condensation of the chromatin and as a consequence, prevents binding of transcription factors to the DNA (transcription is repressed).
Acetylation loosens the association between nucleosomes and DNA (because it neutralizes the positive charge of histones) and consequently promotes transcription. Deacetylation is a process opposite to acetylation.
True statements about the modification of chromatin structure in eukaryotes include the inhibition of transcription when chromatin is condensed, the possibility of inheriting some chromatin modifications by future generations, and that acetylation of histone tails allows transcription while being reversible. In contrast, methylation can promote condensation, and deacetylation actually increases, not decreases, DNA-histone binding.
The modification of chromatin structure in eukaryotes involves several processes that affect gene expression. The statements that are true are:
DNA is not transcribed when chromatin is packaged tightly in a condensed form.Some forms of chromatin modification can be passed on to future generations of cells.Acetylation of histone tails in chromatin allows access to DNA for transcription.Acetylation of histone tails is a reversible process.Methylation of histone tails in chromatin can promote condensation of the chromatin.Deacetylation of histone tails in chromatin does not loosen the association between nucleosomes and DNA; rather, it promotes condensation, thereby making it harder for the DNA to be transcribed due to lessened accessibility to transcription machinery.When DNA is tightly wrapped around histones in a condensed chromatin state, transcription factors and RNA polymerase cannot access the DNA, hence, transcription is inhibited. Chemical modifications, like acetylation and methylation of histone tails, determine the packing level of chromatin and influence gene expression. These processes are part of a broader regulatory system known as the histone code, which can be inherited through cell divisions and potentially across generations, contributing to epigenetic inheritance.
Which of the following represents the correct flow of air into the lung of a mammal?
A. larnyx → trachea → bronchi → bronchioles → alveoli
B. alveoli → tracheoles → bronchi → trachea
C. trachea → bronchioles → bronchi → alveoli
D. trachea → tracheoles → bronchi → alveoli
I believe the answer would be A.
The flow is larynx, trachea, bronchi, bronchioles, alveoli
Larnyx → trachea → bronchi → bronchioles → alveoli is the right flow of air into the lung of a mammal.
What is the pathway of the flow of air into the lungs?The most important function of the respiratory system is to obtain oxygen from the environment for the cells and eliminate the carbon dioxide by exhalation that is produced by the body.Firstly, the air enters the nasal cavity and also the oral cavity.Then it reaches the pharynx, travels to the trachea, then to both the bronchi, secondary bronchi, and tertiary bronchi. It then reaches the bronchioles and finally the alveoli where the exchange of the gases takes place.Oxygen and carbon dioxide are exchanged between the alveoli and this process occurs by diffusion.Hence, Option A is the right answer.
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Research shows that the vast majority of drivers are functionally impaired even at the legal limit of 0.08 blood alcohol content (bac). research shows that the vast majority of drivers are functionally impaired even at the legal limit of 0.08 blood alcohol content (bac).
a. True
b. False
The answer is A. True.
How does biodiversity support healthy ecosystems
ANSWER: Biological biodiversity refers to all the different kinds of life that are obtainable in a particular ecosystem, this include all the plants and animal populations that are found in a particular geographical area.
Biodiversity supports healthy ecosystem because it enhances the productivity and the survival of the ecosystem. For instance, in a situation where there are large number of different plant population in an ecosystem, such population will present variability in genetic make up. If a negative event occur in the ecosystem, it will be possible for some plants to survive. But, in a situation where it is only one type of plant that is obtainable in the ecosystem, it will be quite easy to wipe all of them out at once. For instance, a disease outbreak can easily destroy all the plants.