Answer:
The correct answer is platyhelminthes: flatworms.
Explanation:
Platyhelminthes are generally known as tapeworms or flatworms, these species are ribbon-like and are soft-bodied invertebrates. Some of the species of this phylum live as parasites in animals and human beings. The most distinguishing characteristic of these invertebrates is their flat and ribbon-like appearance.
Some of the characteristics of Platyhelminthes are that their body is dorsoventrally flattened, they show radial symmetry, they do not possess a body cavity and thus are known as acoelomate, they are triploblastic comprising three germ layers, and their body is soft and unsegmented.
if 71% of the earth's surface is covered with water, why is water conservation important?
Leaves need to be elevated so they are exposed to sunlight for photosynthesis. Which part of the stem grows to make this possible?
Nuclear fusion produces more energy than nuclear fission, but requires more initial energy. please select the best answer from the choices provided t f
Answer: The given statement is True.
Nuclear fusion is a phenomenon that involves the formation of larger nucleus when two smaller nuclei fuse together. Large amount of energy is provided to form larger nucleus in order to overcome the electronic repulsion.
On the contrary, nuclear fission involves splitting of larger nucleus into two or more smaller nuclei. Energy is released in this process.
Therefore, more initial energy is required in nuclear fusion.
How can we see brown objects when brown is not a color of the spectrum?
How many amino acids does a tRNA molecule carry to a ribosome?
What might happen if a cell's plasma membrane is not partially hydrophobic?
The lack of a hydrophobic region in a cell's plasma membrane would prevent it from being selectively permeable, impairing the cell's ability to control the entry and exit of various substances, which could be fatal to the cell.
The hydrophobic (water-hating) interior of the membrane is critical in allowing nonpolar and lipid-soluble substances to pass through, such as fat-soluble vitamins and small hydrophobic molecules like O2 and CO2. On the other hand, hydrophilic (water-loving) molecules generally require special mechanisms, such as protein channels, to cross the membrane. Without a hydrophobic region, cell membranes would not be able to prevent the entry of harmful materials or the exit of essential materials, leading to cell dysfunction and potential destruction.
A population will most likely deplete the resources of its environment if the population
Which transport process does the cell use to direct the contents of vesicles out of the cell membrane?
A. Endocytosis
B. Diffusion
C. Exocytosis
D. Passive transport
The right option is; C. Exocytosis
Exocytosis is the transport process that the cell uses to direct the contents of vesicles out of the cell membrane.
Exocytosis is a type of active transport in which substances are moved from within a cell to the external part of the cell with the use of cellular energy. In this process, membrane enclosed vesicles that contain cellular substances are moved to the cell membrane. The vesicles join with the cell membrane and their contents is released out of the cell membrane.
Dna is a specialized carbohydrate contained within cells. t f
The image shows a bean-shaped bacterium with long tail-like projections streaming from it.
What morphology is represented in the picture?
spirilla
rod shaped
filamentous
cocci
Answer:
the answer above is wrong. the right answer is rod shaped I took the test
Explanation:
How do birds and dogs both use DNA as instructions for building their bodies even though they are very different organisms? A. their DNA has different lengths B. their DNA have the same nucleotide bases, but in different patterns C. their DNA has different types of nucleotide bases D. their DNA is made of different types of molecules
Answer:
Their DNA has the same nucleotide bases, but in different patterns.
Identify the mixture of powdered chalk and
powdered table salt and suggest a technique
for separating their components.
1. homogeneous; dissolving followed by filtration and distillation
2. homogeneous; decanting
3. heterogeneous; decanting
4. homogeneous; distillation
5. heterogeneous; distillation
Answer:
The correct answer is option 1.
Explanation:
The powdered chalk and the table salt both can make a homogeneous mixture in a water solution that can be separated with the help of two processes; filtration followed by the distillation.
The chalk powder dissolved in a solution of the salt and water can be separated with the help of the filter paper by the process of filtration.
The salt can be separated by the process of the distillation from the water or liquid and it remains as an extract.
Thus, the correct answer is option 1.
Correct these statements: Freezing the tissue kills the enzyme and changes it shape rendering it useless. Boiling tissue does not affect the enzyme in any way.
Meiosis terminology
Drag the labels from the left to their correct locations in the concept map on the right.
This detailed answer explains meiosis terminology, including homologous chromosomes, crossing over, independent assortment, and nondisjunction.
Explanation:When it comes to meiosis terminology, there are several key terms to understand. Let's start with homologous chromosomes, which are pairs of chromosomes that contain similar genes. Crossing over is the exchange of genetic material between homologous chromosomes during prophase I, while independent assortment refers to the random arrangement of homologous chromosomes on the metaphase plate. Lastly, nondisjunction occurs when chromosomes fail to separate correctly during anaphase I or II, resulting in an abnormal number of chromosomes in the daughter cells.
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Final answer:
Meiosis is a two-part cell division process producing haploid gametes, while fertilization combines these gametes to form a diploid zygote. The cycle alternates between diploid and haploid states, with mitosis occurring in diploid organisms for growth and repair.
Explanation:
Understanding Meiosis and Fertilization
The process of meiosis is fundamental in sexual reproduction, facilitating the production of haploid gametes (sperm and eggs) from diploid cells. It comprises two divisions: meiosis I and meiosis II, reducing the chromosome number by half and ensuring genetic diversity. During meiosis I, homologous chromosomes segregate into different cells, while meiosis II resembles mitosis, where sister chromatids segregate. Fertilization then combines these haploid gametes to form a diploid zygote, restoring the chromosome number.
The lifecycle, incorporating meiosis, mitosis, and fertilization, showcases the transition between diploid and haploid states. In diploid organisms, mitosis is the process of cell division that produces genetically identical cells for growth and repair, occurring in somatic (body) cells. Meiosis, on the other hand, occurs in the germ cells to produce gametes. Finally, fertilization merges two haploid cells to start the cycle anew.
Differentiating between haploid and diploid tissues is essential in this context. Diploid cells contain two complete sets of chromosomes, one from each parent, whereas haploid cells contain a single set of chromosomes. In the lifecycle diagrams, such as that of a fern, these can be color-coded for clarity, with meiosis marking the transition to haploid forms and fertilization returning to the diploid state.
a group of students is counting the number of plastic bags placed in a landfill during a single day. what are the students doing?
A. starting a promblem
b. drawing a conclusion
c. making a hypothesis
d. collecting data
by the way this is ecology!!
Answer: d. collecting data
Explanation:
A typical research design includes a research problem, a testable hypothesis, dependent and independent variables, data collection, experimental methodology and plan for statistical analysis.
According to the given situation, students are collecting the plastic bags from the landfill means they are collecting the data for study.
3 steps of a nervous system reaction
Which type of evidence is least likely to result in changes to a phylogenetic tree?
Over time what could happen to an underwater island that forms near a mid-ocean-ridge
Final answer:
An underwater island near a mid-ocean ridge may evolve over time; starting as a fringing reef, it can develop into a barrier reef, lagoon, and eventually an atoll due to sea-level changes and land subsidence. Volcanic activity at mid-ocean ridges could also lead to the emergence of new islands from seamounts.
Explanation:
Over time, an underwater island near a mid-ocean ridge may undergo significant changes due to factors such as sea-level changes, tectonic subsidence, and volcanic activity. Initially, a fringing reef could form around the island. If the sea level remains stable and the land doesn't subside, the reef might not evolve further. However, if the land undergoes subsidence, the reef may grow upwards, eventually forming a barrier reef and then a lagoon as the island sinks.
Ultimately, if the island submerges completely, an atoll may emerge. Separately, ongoing volcanic activity associated with mid-ocean ridges can lead to the creation of new seamounts, which might eventually break the ocean surface to become a new island. Additionally, the constant accumulation of biogenic sediments could potentially deform the oceanic crust, potentially causing new volcanic activities.
Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle did the nucleus contain 6 picograms of DNA?
A) G₀
B) G₁
C) S
D) G₂
E) M
The DNA content measured in the G1 phase is 3 picograms and this content gets doubled in the G2 phase, where 6 picograms of DNA is observed. Thus, the correct option is D.
What is Cell cycle?A cell cycle is the series of events which takes place in a cell as the cell grows and divides into daughter cells. A cell spends most of its time in the interphase, during this phase the cell grows, replicates its chromosomes, and prepares itself for the cell division. The cell then leaves interphase, and undergoes mitosis, after which it completes its division. Mitosis includes karyokinesis and cytokinesis.
The chromosomal content doubles in the G2 phase of cell division. In the G1 phase, the original chromosomal content is present in the cell which undergoes duplication in the S-phase, that can be observed in the G2 phase.
Therefore, the correct option is D.
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The nucleus contains 6 picograms of DNA during the d) G₂ phase of the cell cycle.
It is important to know the different stages and how DNA content varies:
G₀: Cells are in a resting phase and not actively dividing. DNA content remains constant.G₁: The first gap phase after cell division where the cell grows. DNA content is at its base level, approximately 3 picograms.S: DNA synthesis phase where DNA replication occurs. DNA content increases from 3 to 6 picograms.G₂: The second gap phase after DNA synthesis. DNA content is at 6 picograms as it has doubled in the S phase.M: Mitotic phase where the cell divides. DNA content varies as chromosomes are split between daughter cells.why is it impossible to know the growth phase of cut , broken or shaved hair fragments
What Happens when a ATP loses a phosphate group
Which element is capable of forming long chains by forming single, double, or triple bonds with itself?
Why is it important that the inside of a lysosome have a lower pH than the surrounding cytoplasm in the cell?
Answer
The digestive enzymes in the lysosome work best at a lower pH.
The protein molecules constructed in the lysosome form best at a lower pH.
The substances stored in a lysosome are most stable at a lower pH.
The waste products stored in the lysosome require a lower pH.
The inside of a lysosome has a lower pH than the surrounding cytoplasm because the digestive enzymes in the lysosome work best at a lower pH. The lower pH is maintained by proton pumps in the lysosome membrane.
Explanation:The inside of a lysosome has a lower pH than the surrounding cytoplasm because the digestive enzymes in the lysosome work best at a lower pH. These enzymes, called acid hydrolases, catalyze hydrolysis reactions and their optimal pH is around 4.5. The lower pH inside the lysosome is maintained by proton pumps in the lysosome membrane that pump protons in, creating an acidic environment.
Which component of the DNA molecule provides instructions for protein production?
A deoxyribose sugar molecules
B sequence of nitrogen bases
Answer:
B sequence of nitrogen bases
Explanation:
The instructions that determine all the characteristics and functions of an organism are found in its genetic material: DNA (deoxyribonucleic acid).
The knowledge of DNA, its structure and function, was decisive for the development of modern biotechnology.
Proteins are macromolecules that fulfill varied functions. There are structural proteins, others are enzymes, others carry oxygen such as hemoglobin, there are proteins involved in immune defense, such as antibodies, others perform functions of hormones such as insulin, etc.
Just as DNA is composed of nucleotides, proteins are composed of amino acids. There are 20 different amino acids, and each protein has a particular amino acid sequence that depends on the sequence of nitrogen bases present in the DNA.
The protein synthesis process basically consists of two stages: transcription and translation. In the first stage, the "words" (genes) written in the DNA in the language of the nucleotides are copied or transcribed to another molecule, the messenger RNA (mRNA). Then, in the next stage, the mRNA is translated into the language of the proteins, that of the amino acids. This flow of information is known as the "central dogma of biology."
All the elements of a family in the periodic table have what feature in common?
A) They all have similar chemical properties.
B) They all have the same number of protons in the nucleus.
C) They are all located in the same horizontal row or period.
D) They all have the same number of electrons in the electron cloud
A) They all have similar chemical properties.
If there was a chain of seven amino acids, how many possibilities are there for different proteins?
if all cells in a multicellular organism have the same set of dna what accounts for the differences among different types of cells in a multicellular organism
Final answer:
Different types of cells in a multicellular organism have the same DNA but express different genes, resulting in differences in characteristics and functions among them.
Explanation:
All cells in a multicellular organism have the same set of DNA. However, the differences among different types of cells in a multicellular organism are due to the expression of different genes in the DNA. Each cell only 'reads' the portions of DNA that are relevant to its function. This unique genetic expression of each cell is what leads to the differences in characteristics and functions among different types of cells.
Cells in a multicellular organism differentiate into various types due to the selective expression of genes, even though they all contain the same DNA.
Explanation:Despite all the cells in a multicellular organism containing the same set of DNA, they differentiate into various types of cells with distinct functions and characteristics. This differentiation is a result of gene expression where different genes are turned 'on' or 'off' in each cell. Similar to how actors in a movie all have the same script but only read their parts, cells only 'read' the portions of DNA that are relevant to their roles. As cells differentiate, they not only change in size and shape but also in function, metabolic activity, and more due to the unique genetic expression of each cell type. Even in unicellular organisms, gene expression can vary in response to environmental conditions.
Which is a reason cells divide?
A. To have a smaller surface area
B. To prevent mitosis
C. To replace damaged cells
D. To take up less space in the organism
The most prominent reason for cell division is to replace damaged cells of various organ systems as well as skin. Thus, the correct option is C.
What is Cell division?Cell division may be defined as the process by which cells multiply themselves to synthesize daughter cells with identical genetic material. This process is carried out in all forms of living organisms very efficiently.
Cell division is the process that involves the mechanism of growth, maintenance, repair, and reproduction in living organisms.
All such activities are required for survival and passing their traits to the next generation to maintain their genetic material in nature.
Cell division is an important phenomenon that involves mainly two processes in multicellular organisms. They are as follows:
The growth and repair of tissues.The formation of gametes (eggs and sperm).Therefore, the correct option for this question is C.
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where do babies come from
Answer:
During a sexual inter course which involves a men a women the men releases sperm from the penis head which travels through the woman vagina making it's way up to the egg which is located in the stomach the sperm will then shoot into the egg and stay there after sometime the baby will start to form which usually takes up to nine months and when the nine months is complete the baby is born
Explanation:
after a cell division each daughter cell has
Answer: Daughter cells have the same amount of DNA as the parent cell and a higher surface area/volume ratio than the parent cell.
Explanation:
Cell division is the process by which a cells divide to create two daughter cells. The surface area to the volume ratio gets smaller as the cell gets larger. So the cell has to die or split into smaller cells with favorable surface area/volume ratios. But as cells increase in size, the surface area and volume do not increase proportionally to length. So when a cell increases its diameter, surface area to volume ratio decreases, and this relationship restricts the size of cells.
An example of cell division is mitosis. It involves doubling the DNA and dividing the nucleus into two, so that each daughter cell created receives the same amount of DNA as the mother cell.