Answer:
Quartz falls into a group of minerals called the silicates, all of which contain the elements silicon and oxygen in some proportion.
Explanation:
What is a codon?
A. Group of 6 bases that codes for an amino acid
B. Group of 3 bases that codes for an amino acid
C. Group of 4 bases that codes for an amino acid
D. Group of 2 bases that codes for an amino acid
answer:a unit that consists of three adjacent bases on a DNA molecule and that determines the position of a specific amino acid in a protein molecule during protein synthesis.
Which of these groups is made up entirely of consumers
Answer:
c
Explanation:
Drag each label to the correct location if the image. The image shows a normal fault. Identify the parts of the fault.
Answer
From Left to Right:
footwall, fault plane an hanging wall
Explanation:
below the plane is footwall. the line that splits between below plane and above plane is fault line and the above plane is hanging wall.
Answer correct on Plato
HIV binds to Helper T cells of your immune system.
A. True
B. False
Answer: True
HIV infects a type of white blood cell in the body's immune system called a T-helper cell (also called a CD4 cell). These vital cells keep us healthy by fighting off infections and diseases. HIV cannot reproduce on its own. Instead, the virus attaches itself to a T-helper cell and fuses with it (joins together).
Explanation:
T-cells, the thymus cells, work in a similar way but destroy infected cells rather than manufacture antibodies. In HIV infection, the body mounts a very strong antibody response in the first few weeks that partially works, bringing the viral load down from millions to, on average, about 50,000 copies/ml.
Answer:
The answer is true...
Explanation:
HIV infects a type of white blood cell in the body’s immune system called a T-helper cell (also called a CD4 cell). These vital cells keep us healthy by fighting off infections and diseases.
HIV cannot reproduce on its own. Instead, the virus attaches itself to a T-helper cell and fuses with it (joins together). It then takes control of the cell’s DNA, makes copies of itself inside the cell, and finally releases more HIV into the blood. HIV will continue to multiply and spread throughout the body – a process called the HIV lifecycle.
In this way, HIV weakens the body’s natural defences and over time severely damages the immune system. How quickly the virus develops depends on a person’s general health, how quickly they are diagnosed and start antiretroviral treatment, and how consistently they take their treatment
The pelvis bone functions as an attachment point for legs. So, the pelvis bone found in dolphins is organ. Information about this organ tells us that
Answer:
Explanation:
Answer 1 will be vestigial and answer 2 will be dolphins evolved from organisms with legs. Vestigial organs are those which are not in use but were once used by our ancestors for example an appendix
Answer:
vestigial and dolphins evolved from organisms with legs
Explanation:
You have a sore throat from a viral disease. A friend suggests you get a prescription for an antibiotic. What would you say, and why?
Inhibitors of microtubule synthesis inhibit mitosis by preventing the formation and function of which of these?
Answer:
Mitotic inhibitors are derived from natural substances such as plant alkaloids, and prevent cells from undergoing mitosis by disrupting microtubule polymerization, thus preventing cancerous growth. ... Mitotic inhibitors interfere with the assembly and disassembly of tubulin into microtubule polymers.
Mitotic inhibitors are the drugs which stop the mitosis where 1 cell gets divided into 2 , 2 to 4 and 4 to 8 in order to form identical cells. Inhibitors of microtubule synthesis inhibit mitosis by preventing the formation and function of microtubules.
What are microtubules made up of ?
Microtubules are made up of tubulin protein where they have the ability to show assembly and dissemble same as actin filaments.
Natural alkaloids are the inhibitors that prevent these mitotic spindle fibres to show any kind of assembly or dissembly in order to prevemnt multiple growth of the cells.
The multiple growth of cells will lead to condition called as tumor which is hazardous and abnormal cell growth condition.
The microtubules has a function of support, organisation of cytoplasm, chromosome segregation and many more.
These basically makes the skeletal structure of the cell and made up of tubulin alpha and beta structures.
Therefore, natural inhibitors alkaloids stops mitotic spindle fibres to stop showing any kind of assembly.
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Cell division occurs in animal cells and plant cells. The illustration below shows an animal cell and a plant cell during the same phase of cell division.
Which of the following best describes this phase of cell division?
A. The cells are completing the growth phase and entering prophase.
B. The chromosomes in each cell have just replicated, and the cells are entering mitosis.
C. Mitosis is complete and the plant cell is forming a cell plate because plants have cell walls.
D. The cells are in metaphase, and the animal cell is drawing inward where chromosomes will line up for separation.
Answer:
C
Explanation:
The membrane of the animal cell is beginning to pinch off indicating cytokinesis which is the final stage of mitosis in eukaryotes
The plant cell has entered telophase (the final stage of cell division for prokaryotes) as a cell plate has formed as well as two separate nucleus'
Which of the following is a feature of all cells?
O A. All cells have a nucleus.
O B. All cells have a rigid cell wall.
O C. All cells are spheres.
O D. All cells have a cell membrane.
All cells have a rigid cell wall is a feature of all cells. Therefore, option (B) is correct.
What are the characteristics of cell wall?A plant cell's cell wall is its outermost covering. It is a tough, pliable, and occasionally rigid layer that provides the cell with structural support and protection. There is no cell wall in animal cells.
Plant cells' tensile strength and resistance to mechanical and osmotic stress are provided by the cell wall, which encloses the plasma membrane. Additionally, it permits the development of turgor pressure, or the pressure of the contents of the cell against the cell wall.
The cell's interior contents are kept separate from the outside environment by the cell wall. It also gives the cell and its organelles shape, support, and protection. However, only a few prokaryotic organisms, eukaryotic plants, and fungi contain this cellular component.
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Which component of the biosphere is an example of inorganic matter?
A. Protein
B. Carbohydrate
C. Carbon dioxide
D. Sugar
Carbon dioxide is an example of an inorganic molecule.
What is biosphere ?The biosphere is the part of the Earth's surface and atmosphere where living organisms exist. It includes all the biotic (living) components, such as plants, animals, and microorganisms, as well as the abiotic (non-living) components, such as water, air, and soil.
Inorganic matter refers to non-living substances that do not contain carbon-hydrogen bonds. Carbon dioxide (CO2) is an example of inorganic matter because it does not contain carbon-hydrogen bonds and is not produced by living organisms.
Instead, it is a naturally occurring gas that is part of the Earth's atmosphere and is released through natural processes such as respiration, volcanic activity, and the burning of fossil fuels.
Proteins, carbohydrates, and sugars are examples of organic matter because they contain carbon-hydrogen bonds and are produced by living organisms through biological processes such as photosynthesis and cellular respiration.
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List 3 skills that early man had to master in order to survive in physical education
Answer:
Survival skills are techniques that a person may use in order to sustain life in any type of natural environment or built environment. These techniques are meant to provide basic necessities for human life which include water, food, and shelter. The skills also support proper knowledge and interactions with animals and plants to promote the sustaining of life over a period of time1. ---------------- is non- metal used in the vulcanisation of rubber. 2--------------- is used making fertilisers. 3. ----------------- is used in to matchstick heads. 4---------------- crystals are used for keeping time in watches . 5.---------------is a non-metal that has a high melting point. 6.------------ metal is found in a pure state in nature. 7.------------------ is the most. abundant metal on the earth. 8 . is a non-metal present in hair eggs and wool. 9. metal that is used to harden steel. 10 . metal is used to galvanise iron . plz help 5 minute.
Answer:
1. sulfur
2. ammonium nitrate
3. potassium chlorate
4. quartz Crystal's
5. Diamond
6. aluminum
7. aluminum
8. keratin
9. chromium
10. zinc
Explanation:
1. SULFUR is non-metal used in the vulcanization of rubber.
2. AMMONIUM NITRATE is used to make fertilizers.
3. POTASSIUM CHLORATE is used to matchstick heads.
4. QUARTZ crystals are used for keeping time in watches.
5. DIAMOND is a non-metal that has a high melting point.
6. ALUMINUM metal is found in a pure state in nature.
7. ALUMINUM is the most abundant metal on the earth.
8. KERATIN a non-metal present in hair eggs and wool.
9. CHROMIUM metal that is used to harden steel.
10. ZINC metal is used to galvanize iron
Identify one abiotic factor present in a pond ecosystem and explain how this abiotic factor would affect the frogs in a pond
Which molecule uses Facilitated Diffusion to move from high to low concentration across a cell membrane?
A. water
B. oxygen
C. glucose
D. carbon dioxide
Answer:
C. glucose
Explanation:
Passive transport does not require energy input. An example of passive transport is diffusion, the movement of molecules from an area of high concentration to an area of low concentration. Carrier proteins and channel proteins are involved in facilitated diffusion.
A team of researchers is studying the distance between ribosomes attached to the rough ER in a type of cancer cell. The researchers are writing a grant to provide support for a microscope to use to study this. They need to purchase a microscope with a very high magnification to observe the distance between individual ribosomes in a cross section of a cancer cell. Based on the information given, what type of microscope would you suggest
Answer:
The correct answer is - Electron microscope.
Explanation:
The electron microscope is one microscope among all other types of microscope that has the ability to get high magnification and resolution levels, That helps in look and study things right down to each individual atom.
The light microscope is not able to show direct structures of the cell components such as cell membrane, ribosomes, ER, and other organelles. To see them we need to achieve the high magnification power that is provided by an electron microscope.
Apart from muscles contracting, what other types of activities has your body done in the past 24 hours that require energy? Complete the list below.
Answer:
Digestion, excretion and transportation of substances.
Explanation:
Chemical reactions such as breakdown of food, cleaning of blood and absorption of nutrients and digestion are the activities that our body done with the use of energy. Digestion of food needs energy for the breakdown of food with the help of several enzymes. Transportation of waste materials and other substances also needs energy. Our cells absorb nutrients with the help of energy molecules through active transport.
What is the correct levels of organization from smallest to largest?
A. organs. tissue, cells, organ system
B. cells, tissues, organs, organ system
C. cells, organs, tissues, organ system
D. tissues, organ system, organ, cells
Answer:
B. cells, tissues, organs, organ system
Explanation:
This is the correct levels of organization from smallest to largest. Hence, option (B) is the correct sequence.
A scientist studied four rock fossils that show evolution of the modern-day horse dating back to 35 million years, 15 million years, 8 million years, and 1 million years ago. Which rock fossil is most similar to the modern-day horse?
Answer:
Probably the 1 million one because it is the closest time or ancestor to the current horse.
Explanation:
Compare and contrast the concentration of the toxin in
the seaweed, shrimp, small fish and shark
Answer:
?????????
Explanation:
Select the five stages of the nitrogen cycle.
desalinization
ammonification
nitrification
exhalation
assimilation
denitrification
absorption
exclusion
fixation
extension
1) Nitrogen fixation
2) Nitrification
3)Assimilation
4)Ammonification
5)Denitrification
Answer:
hope this helps!
Explanation:
In general, the nitrogen cycle has five steps:
- Nitrogen fixation (N2 to NH3/ NH4+ or NO3-)
- Nitrification (NH3 to NO3-)
- Assimilation (Incorporation of NH3 and NO3- into biological tissues)
- Ammonification (organic nitrogen compounds to NH3)
- Denitrification (NO3- to N2)
source: https://www.fondriest.com/news/nitrogencycle.htm
Why is the elimination of feaces not an excretory process?
Answer:
Feaces is a product of egestion. It is not directly formed from the major organs responsible for excretion (liver, kidneys, lungs and skin) and hence is not a result of metabolic reactions. That is why, feaces are not an excretory product.
Explanation:
What is sprouting?
Why do we need to have calcium rich foods?
Answer:
(i) Sprouting is the natural process by which seeds or spores germinate and put out shoots, and already established plants produce new leaves or buds or other newly developing parts experience further growth.
(ii) It makes up much of your bones and teeth and plays a role in heart health, muscle function and nerve signaling
Why could a loss of chlorophyll limit cellular respiration in plants?
A. there would be too much oxygen to produce.
B. there would be less glucose produce for respiration.
C. there would be too much carbon dioxide produced.
D. there would be more ATP molecules produce.
Answer:
the answer is option B as chlorophyll is used to.mske glucose whivh is later utilized in respiration
Which of the following would be the best definition of diffusion? The movement of molecules....
- from an area of higher concentration to an area of lower concentration
-using energy
-down the concentration gradient
-from an area of lower concentration to an area of higher concentration
-using energy
-up a concentration gradient
-from an area of low concentration to an area of high concentration
- without energy
- up the concentration gradient
-from an area of higher concentration to an area of lower concentration
-without energy
-down the concentration gradient
Answer:
-from an area of higher concentration to an area of lower concentration
-without energy
-down the concentration gradient
Explanation:
Simple diffusion does not require energy. This is likely what the question is referring to.
An example of simple diffusion:
If you blow up a balloon and then poke a small hole in it. The air will leak out from the high concentration inside the balloon to the low concentration outside of the balloon. It does not require any energy to be put it--it leaks out on its own as long as there is a hole.
Answer:
-from an area of low concentration to an area of high concentration
- without energy
- down the concentration gradient
Explanation:
The movement of molecules from an area of low concentration to an area of high concentration, without energy, down the concentration gradient is correct.
TWO evidence of global warming in South Africa
Answer:
Observable effects of climate change on water resources in Africa include: flooding, drought, change in distribution of rainfall, drying-up of rivers, melting of glaciers and the receding of bodies of water.
Explanation:
thank me later
onment is brought into the area. It has no predato
ation. Overpopulation can use up the resources ir
oes not impact the environment in any way.
Ltion because they are an additional species in the
lation. However, overpopulation has a positive effe
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Over the years humans have killed most of the coyotes in a grassland habitat the coyotes were the natural predators of deer living in the grassland how will this most likely change competition for resources in the grassland
Answer: Humans killing a majority of the natural predators will cause a drastic increase of the prey populations and make food,shelter and other resources scarce.
What are sustainable use practices?
any materials that exist in nature and that are used by humans
the managed consumption of natural resources to prevent their depletion or environmental destruction
the deployment of fossil fuels to environments that previously did not have access to such resources
ways in which individuals are able to conserve native animal and plant species
Answer:
B.
Explanation:
Sustainable practices are all about the managed consumption of natural resources to prevent their depletion or environmental destruction.
What is sustainability?It refers to the management of resources in such a way that their depletion is prevented and the environment is conserved in the process.
Sustainable practices include actions targeted at conserving resources to prevent abusive or wanton use and ensure that the future heritage is intact.
For example, cutting down trees for construction and following it up with the planting of other trees is a sustainable practice. By doing so, trees will not get depleted in the forest.
The correct option is, therefore, the first option.
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Why does the rate of reaction decrease after the optimal temperature, in this case, is reached?
A. The enzyme's active site has changed shape
B. The enzyme has done it's job so it doesn't work anymore
C. The substrate has changed shape
Answer:
A. The enzyme's active site has changed shape
Explanation:
The rate of reaction decrease after the optimal temperature, when the enzyme's active site has changed shape.
A steady increase in global temperature has been recorded
between 1900 and today. Before concluding that this rise in
temperature is the result of the increased burning of fossil
fuels since that same time, which of the following questions
would have to be answered?
A What is the CO2 content in one metric ton of fossil
fuels?
B Which gases are released when burning fossil fuels?
C What, if any, temperature rise was occurring prior to
1900?
D How have humans adapted to temperature change?
Answer:
C
Explanation:
C What, if any, temperature rise was occurring prior to 1900?
What gas in the atmosphere reacts with sulfur dioxide to create sulfur trioxide?
O nitrogen
o hydrogen
O acid rain
oxygen
