Living organisms breathe gases in the atmosphere.
What are Three macromolecules that can be used as an energy source?
Answer:
There are four major classes of biological macro-molecules (carbohydrates, lipids, proteins, and nucleic acids); each is an important cell component and performs a wide array of functions
Explanation:
Large quantities of solid water are stored in the ___
Answer:
Ice sheets
Explanation:
Water is stored in solid, frozen form in ice sheets and glaciers, and in snowpack at high elevations or near Earth's poles.
Identify the structures and
functions of the male and
female reproductive systems.
Answer AND Explanation:
MALES
Testes: they are oval shaped structures that produce the male gametes and sex hormone called testosterone.
Seminiferous tubules: tubules where spermatogenesis occurs.
Vas deferens: are tubules which lead to the epididymis.
Epididymis: is along, coiled tube for storage of sperms. it contraction and relaxation pushes sperms out and allows ejaculation through the urethra.
Accessory glands like the seminal vesicles, cowper's gland and prostate gland produce seminal fluid that provides a nutrient medium for sperms to swim in.
Scrotum: contains the testes outside the body.
FEMALES
Ovary: these are oval-shaped structures that produce female gametes and sex hormones.
Oviduct: these are hollow structures with an expanded funnel-shaped opening which accepts the released ovum and directs it to the fallopian tube. Fertilization takes place in the oviduct forming zygote.
Uterus: has an inner layer called endometrium which becomes folded and vascularised to allow implantation. The endometrium nourishes the embryo..
Cervix: is a muscular ring between the uterus and the vagina. It secretes a plug of mucus, which prevents entry of pathogens and air
The vagina is a muscular copulatory canal into which penis enters. Vagina also allows passage of foetus during parturition.
How is water used in homes, industry, and agriculture ?
Answer:
industrial water is used for fabricating, processing, washing, diluting, cooling, or transporting a product. In homes water is used to drinking, preparing food, bathing, washing clothes and dishes, brushing your teeth, watering the yard and garden, and even washing the dog. In agriculture it is used to grow plants and susutain livestock
Explanation:
Water is primarily used for agriculture, industry, and municipal needs. In agriculture, it is used for irrigation. In industry, it is essential as a coolant, solvent, and for generating electricity, while in homes, it is used for daily domestic tasks and treated after use.
Water is essential for various daily activities and industrial processes. The greatest use of water is in agriculture, where it is predominantly used for irrigation to grow crops. In the industrial sector, water plays a crucial role as a coolant, solvent, and as a part of many chemical processes. It is also vital in generating electricity, especially in nuclear power plants where it is used to moderate and cool the reactor core. For municipal use, which includes both homes and businesses, water is used for domestic purposes such as personal hygiene, food preparation, cleaning, gardening, and in sewage systems. In the home, water is utilized for drinking, cooking, bathing, washing dishes, doing laundry, and flushing toilets. After use, water is treated at sewage treatment plants before it can be prepared for reuse.
the level of cyclins in a cell increases during the M phase of the cell cycle what might happen to a cell if no cyclins were present during the M phase
Answer:
If cyclins were not present in phase M of the cell cycle, cell division would not be possible, since that phase could not be initiated.
Explanation:
Cyclins are regulatory proteins within the cell cycle and, specifically in phase M, are responsible for causing the nucleus to lose its nuclear envelope and heterochromatin condenses to form chromosomes.
During the cell division phase (phase M) the M-cyclins are the initiators of the events that initiate this process. To that end, they must bind to inactive enzymes, Cyclin-dependent kinases (CDKs), and activate them.
M-cyclins remain inactive in other phases of the cell cycle, inhibited by inhibitory protein factors that keep them phosphorylated. Phosphatases enzymes eliminate phosphorylation of cyclines, increasing their levels within the cell. Once active, kinases activate CDKs, and phase M begins.
If M cyclins were not present, or it was not possible to dephosphorylate them, the M phase of the cell cycle could not be initiated.
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If no cyclins were present during the M phase, then the cell cannot progress through the cell cycle.
The cell cycle can be divided into interphase where DNA replication occurs and a mitotic (M) phase, where cell division occurs.Cyclins are proteins that control the progression through the cell cycle.During specific restriction points of the cell cycle, cyclins interact with Cyclin-dependent kinase (CDKs), thereby activating them to produce functional enzymes that phosphorylate target proteins during the progression of the cell cycle.In conclusion, if no cyclins were present during the M phase, then the cell cannot progress through the cell cycle.
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a protein may consits of a many as ___ amino acid molecules
Answer:
21
Explanation:
Amino acids are the basic structural units of proteins. Our bodies contain 21 amino acids it uses to make all proteins, although books recognize only 20 amino acids. The 20 amino acids are the alphabet of proteins.
There are conflicting opinions about the use of gm crops. Imagine this scenario: today we are faced with diseases we have never had to combat before; HIV-AIDS, ebola. Imagine our agricultural corn crops are hit by a similar virulent pathogen; one that attacks members of the Zea species. Given the history of corn in the Western Hemisphere what would be the best strategy for survival of the Zea species?
A) Conduct research and find a way to kill the pathogen
B) Decrease the gene variation in favor of more GM corn-varieties
C) Increase genetic variation and breed plants to contain the wild variety
D) Conduct research to find a natural predator of the disease-causing pathogen.
Answer:
first off i love your pfp and the answer is D
Explanation:
The best strategy for the survival of the Zea species if our agricultural corn crops are hit by a virulent pathogen is option C, to increase genetic variation and breed plants to contain the wild variety. This approach maximizes the genetic diversity within the species, potentially leading to natural resistance to new pathogens.
Explanation:The question 'What would be the best strategy for survival of the Zea species, if our agricultural corn crops are hit by a virulent pathogen?' involves considering the consequences and benefits of different strategies to protect the species from disease.
The best option is likely C) Increase genetic variation and breed plants to contain the wild variety. This strategy could help in developing resistance to the pathogen by maximizing the genetic diversity within the Zea species.
Genetically modified organisms (GMOs) have been used, for example, to create GM crops like corn that are resistant to diseases and pests. However, monocultures and decreased genetic variation can make crops more susceptible to pathogens. Increasing genetic variation inherently provides a greater probability that some plants will have resistance to new pests and diseases, safeguarding the food supply and biodiversity.
While the other options may also be part of an integrated approach to disease management, increasing genetic variation is a fundamental strategy that echoes the natural evolutionary arms race between plants and their pathogens.
What do you think is bigger- cells or atoms and what is your supporting evidence?
cells are bigger then atoms
A model of cell division is shown here. A student evaluates the model and makes the claim that the cell division increases genetic variation in the daughter cells. Which evidence from the model supports the student's claim?
Final answer:
The evidence from the given model that supports the claim that cell division increases genetic variation in the daughter cells is the fact that each division doubles the number of cells.
Explanation:
The evidence from the given model that supports the claim that cell division increases genetic variation in the daughter cells is the fact that each division doubles the number of cells. As the cell divides, the genetic information is replicated and distributed to each of the daughter cells. This process leads to an increase in the number of cells with different combinations of genes, resulting in genetic variation.
Question 16
1 pts
Describe one of the extinction events in our geologic history. In your description,
describe what type of life forms were wiped out and the most accepted theory of the
cause.
Answer and Explanation:
The Cretaceous–Paleogene extinction, which occurred around 66 million years ago, is defined as a mass extinction that wiped out around three-quarters of species on Earth.
Among the organisms that disappeared during this event, we find mammals, birds, fish, sharks, pterosaurs, birds, reptiles, insects, and some plant species.
This event is marked by the presence of a sediment layer known as the K-Ph boundary which showed important levels of iridium, an element that is abundant in craters. Therefore, after its discovery, scientists hypothesize this extinction occurred due to the impact of the giant Chicxulub crater which changed the conditions of the atmosphere.
what atom carries a positive or negative charge?
Answer:
Explanation:
electrons
How do the physical and chemical properties of the element change?
A. within a group
B. across each period
C. within a family
D. across each group
Geographic isolation may result in
Which of the following terms refers to the exactness of a measurement?
Answer:
everything
Explanation:
Which are characteristics of leeches? Check all that apply.
They are parasitic.
They are a type of roundworm.
They have setae.
They have medical uses.
They are segmented.
Answer:
They are parasitic.
They are not a roundworm.
Leeches lack setae.
Yes they do have medical uses.
Yes leeches are segmented.
Sorry if I am wrong
They are parasitic.
They are a type of roundworm.
They have medical uses.
are all correct
atomic structure tga pdf
Answer:
The Pair Distribution Function (PDF) provides the probability of finding an atom at a distance "r" from a given atom.
Explanation:
Atoms are made up three particles protons, neutrons and electrons. The PDF is the Sine - Fourier transform of the total scattering diffraction pattern.
The Atomic structure pdf is used to find the average and short range structure for disordered crystalline materials, nanomaterials and amorphous materials.
Local Distortions, Chemical short range order, nanomaterial structure and amorphous structures are some of the studies that can be done by pdf technique.
The atomic structure refers to the arrangement of protons, neutrons, and electrons in an atom. The model proposed by Ernest Rutherford and the use of tools like a scanning tunneling microscope contribute to our understanding of this theory.
The atomic structure refers to the arrangement of protons, neutrons, and electrons within atoms. In 1938, Ernest Rutherford made valuable contributions to the development of the atomic structure theory. The atomic structure can be studied even further with tools like a scanning tunneling microscope, which can provide an image of surfaces down to the atomic level, like the surface of graphite, with atoms arranged in hexagons.
Rutherford's work was groundbreaking and formed the basis for much of our modern understanding of the atom. His model proposed that atoms consist of a tiny, dense, positively charged core (nucleus) surrounded by negatively charged electrons. This is sometimes referred to as the 'planetary model' because the electrons move around the nucleus in paths that resemble the orbits of planets around the sun.
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is this population in hardy-weinberg equilibrium
Yes, the hardy-Weinberg equilibrium deals about the population and stuff
Explanation:
Definition:
Hardly Weinberg principle is also known as Hardly Wein-berg equilibriumIn simple terms, Hardy Weinberg equilibrium can be stated as the genetic variation in a family will always remain constant from one generation to the next generation during the absence of disturbing influencesFormula:
The Hardly Weinberg equation is represented in the form of,
p2 + 2pq + q2 = 1
where,
p2 denotes the statistics of AA (homozygous dominant)
2pq denotes the statistics of Aa (heterozygous)
q2 r denotes the statistics of aa (homozygous recessive)
Conditions for Hardly Weinberg Principle:
The condition for the Hardly Weinberg conditions are listed below here,
1.No gene flow
2.No natural selection
3.Random Mating
4.large population size
5.no mutation
Answer:
its no
Explanation:
Which of the following do waves transfer
1- Matter
2- Energy
3- Matter and Energy
4- the medium
Answer:
The correct answer is : 2- Energy.
Explanation:
Waves are produced due to vibration or movement of molecules about their mean position in response to any disturbance generated on them.The disturbance transmits energy into the stationary molecules present in a medium.After taking up this energy the stationary molecules begin to vibrate about their mean position, hits the molecules next to it and transmit its energy to them.This process continues and eventually the energy gets transmitted through all the stationary molecules present in medium resulting in the generation of a wave.However, waves does not always require a medium to travel, but vibration or oscillation is necessary. Based on this two types of waves are:Electromagnetic Waves (Light) : Here the electric and magnetic fields oscillates with respect to each other and generates a wave. Mechanical Waves (Sound) : It requires a medium to travel and the waves moves by episodes of compressions and rarefactions.Based on direction of vibration, waves are of two types:Longitudinal waves - Vibration occurs in a direction that is parallel to the direction of motion of the wave.Transverse waves - Vibration occurs in a direction that is perpendicular to the direction of motion of the wave.formation of sperm cells
Answer:
Spermatogenesis takes place in the seminiferous tubules, which are an intricate system of tubules in the testes where spermatogenesis takes place. ... A sperm cell lashes its flagellum back and forth to propel the sperm forward.
1.
In humans, oxygen enters the bloodstream from the
. (1) diaphragm
(3) trachea
(2) air sacs
(4) nasal cavity
Answer:
Oxygen enters the blood stream through the alveoli, which are tiny air sacs in the lungs where gas change is exchanged. Carbon Dioxide goes in through the alveoli and out goes oxygen.
2. air sacs
Hope this helps ;)
Final answer:
Oxygen enters the bloodstream from the alveoli, which are tiny air sacs in the lungs. Here, through the process of external respiration, oxygen is transferred into the blood. The correct answer to the question is (2) air sacs, referring to the alveoli where gas exchange actually occurs.
Explanation:
In humans, oxygen enters the bloodstream from the alveoli, which are tiny air sacs in the lungs where gas exchange takes place. As you breathe in, oxygen-rich air first travels through your mouth and nose, down the trachea, and then through a series of branching bronchi and bronchioles before finally reaching the alveoli. It is here, in the alveoli, that oxygen passes through the walls of the air sacs and into the blood in the surrounding capillaries. This process is known as external respiration.
The correct answer to the question is (2) air sacs, referring to the alveoli where gas exchange actually occurs.
What is capillary action? Give examples
Answer:capillary action.
It is the ability of a liquid to flow in a narrow container without the force of gravity. It is aided by adhesive and cohesive force between the liquid medium.
Explanation:example: Tears draining from the eyes, movement of ink to the tip of the pen.
Capillary action is the movement of a liquid within a narrow tube due to the balance of cohesive and adhesive forces. This natural phenomenon facilitates the absorption of water and nutrients in plants and is also used in medical tests to draw small amounts of blood into capillary tubes.
Explanation:Capillary action is the phenomenon where a liquid moves up a narrow tube against the force of gravity. This movement is the result of the balance between cohesive forces, which are the forces that keep the liquid molecules together, and adhesive forces, which are the attractions between the liquid molecules and the surface of the tube.
In nature, capillary action is crucial for the movement of water from the soil into the roots of plants via the xylem tubes. In medicine, capillary action is exploited for drawing small amounts of blood during medical tests.
Examples of capillary action include the movement of water in thin tubes, the process of water and nutrients absorption in plants, and the wicking of fluids in paper or cloth. An everyday example is ink rising in the nib of a fountain pen or the absorption of water by a towel.
Capillary Action in Everyday Life and Biomedical Applications
In everyday life, we observe capillary action when a sponge absorbs water or when a paper towel picks up a spill. Biomedical applications of capillary action are particularly notable in medical testing—such as glucose testing for diabetics—where blood is drawn into a narrow glass tube by this phenomenon.
Identify and explain the functions of each numbered plant organ in the diagram.
1.flower,2.leaf,3.stem,4.roots
Plant organs include roots, stems, leaves, and reproductive parts. Roots absorb water and nutrients, stems transport and support, and leaves conduct photosynthesis. Modifications to these organs help plants adapt to their environments.
Explanation:Plant Organ Functions and Modifications
In biology, understanding the functions of different plant organs is essential for grasping how plants live, grow, and interact with their environment. The four main plant organs include roots, stems, leaves, and reproductive organs. Roots are responsible for anchoring the plant and absorbing water and nutrients from the soil, while stems provide support and transport these resources to other parts of the plant. Leaves are the primary sites of photosynthesis, where light energy is converted into chemical energy. Reproductive organs such as flowers, fruits, and seeds are key to plant sexual reproduction and the spread of the species.
Different plant adaptations may lead to modifications of these organs, such as changes in the leaf structure to reduce water loss or root modifications to better store nutrients. When identifying organ modifications in a diagram, it's useful to assign a color for each type of organ using a key and then apply these colors accordingly.
To study the structure of leaves in detail, diagrams often highlight the different tissues including the mesophyll, veins, and epidermis, all of which contribute to the leaf's ability to make food. Drawing a simplified diagram of a mesophytic leaf cross section, for example, can serve as an easy reference for identifying and understanding each tissue's function.
What are two factor that can affect the PCB level whales
Answer:
PCBs- polychlorinated biphenyls cause cancer, suppress the immune system, disrupt hormonal signals and impair reproduction.
Explanation:
1. Widespread
PCBs can easily be spread, they often fail to remain in the medium in which they are released, moving instead within and between different phases or compartments of the environment (atmosphere, soil, sediment, and water). Plankton ingest the PCB, fish consume the plankton and whales eat the fish. With this tier of food Web, PCB becomes more concentrated.
2. Global purification
Though the use of PCB is banned in most countries, it's widespread usage lead to its remaining in the ecosystem and being spread further in the ocean.
Which group could the plant belong to? Check all that apply.
A. Bryophytes
B. Pteridophytes
C. Gymnosperms
D. Angiosperms
E. Monocots
F. Dicots
Answer: is the 4 and the 6 one
Explanation:
What is a draw back of raising fish in fish farns
Answer:
Fish farming can be described as a method which is devised to raise fishes commercially in tanks or ponds.
Some of the disadvantages of creating fish cultures are:
Keeping fishes in closed tanks increases their chance of getting a disease. If a disease is caused by a contagious microorganism then the disease will spread in every fish in the tank as its a closed proximity.There will be less genetic variation in fishing tanks.The certain antibiotics and chemicals used in fish tanks and ponds might be toxic for the fishes and effect their health.
Final answer:
Raising fish in fish farms can cause environmental issues such as non-native species escaping and becoming invasive, altering native genetic pools, decreasing dissolved oxygen levels, and spreading diseases to wild populations, which affects marine ecosystems and local human communities.
Explanation:
One drawback of raising fish in fish farms is the risk of non-native species escaping into local ecosystems. Such escapes can lead to genetic introgression, where the aquaculture species mix with native ones, potentially altering the local genetic pool. Additionally, non-native species can become invasive, outcompeting or preying on native fish, leading to a decrease in native fish populations. This phenomenon can result in lower levels of dissolved oxygen in freshwater habitats across North America, as the influx of farmed fish increases competition for resources. Moreover, the escaped fish from aquaculture can spread diseases to wild populations, which is another serious concern.
Fish farming practices using non-native species contribute to the restructuring of marine ecosystems. This restructuring often diminishes the role of native and previously dominant species, affecting ecological balance and local human communities reliant on fishing for their livelihood. The introduction of non-native species through aquaculture, with a high likelihood of escape, should be considered when assessing the overall sustainability and environmental impact of fish farms.
The moon’s _______affects the oceans’
tides on Earth. fill in the blank
Answer:
Gravitational pull
cause it Generates tidal force
How do the chromosomes in most cells of an organism, such as the leaf cells of a plant, compare to the chromosomes in its reproductive cells, which are sperm and egg cells?
Answer:
The chromosomes in all the cells of the body, except for the sex cells, are diploid in number. The somatic cells divide by the process of mitosis.
The chromosomes in the sex cells are haploid and divide by the process of meiosis. This is because when an egg cell and a sperm cell will join, then each half of the chromosomes present in both the cells will pair up to maintain the chromosome number of the species.
Which of the following conditions is not based on the Hardy-Weinberg principle? Large population size No mutations Randomly mating populations Selective breeding
Selective Breeding
Explanation:
Hardy Weinberg principle saying that under certain conditions, the genotype frequency and the allele frequency will remain constant in a sexually reproducing population over a generation. If this principle is true, then he is saying that evolution must be stopped at some point in life. The conditions which maintain his principle are no gene flow, random mating, no mutation, no natural selection, and large population size. So, small population, natural selection, nonrandom mating, mutation, will disrupt Hard-Weinberg. equilibrium.Which event is the most likely cause for the four periods when punctuated equilibrium seems to have occurred?
aated
meteorite bombardment
stasis
mass extinction
global warming
um
Answer:
The correct answer is : Stasis.
Explanation:
Puntuated Equilibrium is an evolutionary phenomenon in which the species undergo two different types of phases,Stasis (slow) : This is the period when evolutionary change occurs very slowly in the species. The species accumulate mutations at random now. However, the effects of the mutations are are not so influential that it would cause drastic evolutionary change in the species.Speciation (rapid) : Due to the accumulation of multiple mutations in the stasis period, some of the individuals belonging to the species develop certain phenotypes that are beneficial to them. These individuals with distinctly different phenotypes with respect to the other individuals can develop into a new species.Answer:
global warming
Explanation:
gradpoint
As ocean depth increases, pressure increases, and temperature decreases. True False
Answer:
This is true.
Explanation: