Which of these is not true of enzymes?
a. enzymes speed up reactions in cells.
b. enzymes work the same at all temperatures.c. enzymes work only in a relatively narrow ph range.d. enzymes work on specific chemicals?

Answers

Answer 1
the incorrect one is b. different enzymes has a different optimum temperature.
Answer 2
Final answer:

Enzymes are proteins that speed up reactions in cells, but they are not effective at all temperatures. They also have specific pH ranges and work on specific chemicals.

Explanation:

The correct answer is b. enzymes work the same at all temperatures. Enzymes are proteins that act as catalysts in cells, speeding up chemical reactions. However, enzymes have a specific temperature range in which they work optimally, and extreme temperatures can denature or inactivate them.

Enzymes also have specific pH ranges in which they function best, with some enzymes working in acidic conditions and others in alkaline conditions. Lastly, enzymes are highly specific in their action, typically working on particular substrates or chemicals.

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Related Questions

Which of the following is true regarding the cell theory? A.Cells are non-living entities. B.Cells can be formed from living or non-living things. C.Cells are the basic units of life. D.All living organisms are made of one or more cells.

Answers

D.All living organisms are made of one or more cells.

The statement that is true regarding cell theory cells are the basic units of life. Thus, option C is correct.

What is cell theory?

Cell is defined as the base of life as it is the structural as well as functional unit of life. Cell is made up of pre existing cells and the cell contain various cell organelles such as mitochondria, endoplasmic reticulum, ribosomes, golgi appratus, nucleus, and cytoplasm.

Basically, cell is of two type one in prokaryotic and another one is eukaryotic. The prokaryotic cell is known as pre mature cells as they do not contain cell organelles and eukaryotic cell are known as advanced and developed cells as they contain several cell organelles.

The unicellular animals are made up of single cell and all the functions carried out in a single cell like amoeba and multicellular organisms are made up of multiple cells and there is specific cell for specific functions.

Therefore, The statement that is true regarding cell theory cells are the basic units of life. Thus, option C is correct.

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Which distinguishes vertebrates from invertebrates?

A) Invertebrates live in the ocean.
B) Invertebrates develop into fossils.
C) Vertebrates are predators.
D) Vertebrates have a central nervous system.

Answers

D, as invertebrates do not have a central nervous system.

If a splice site sequence was mutated so that splicing did not take place, what would the effect be on the mrna

Answers

Splicing is the cutting of some parts of the RNA resultant of the transcription (pre-mRNA) turning it into a mature messenger RNA (mRNA). The parts that are cut off are called introns and will not have a part on the translation. When splicing does not take place in a certain site, intron will not be removed there and that will affect how mRNA will be then translated.

Is baking powder a homogeneous or heterogeneous mixture?

Answers

Baking powder is a homogeneous mixture meaning that it appears to be a single item. You are unable to see the different components that make up the final baking powder product.

How do activities in the large intestine maintain homeostasis?

Answers

Activities in the large intestine that is absorption of water from feaces maintain the water level in the body

Which type of bond forms between two water molecules?

ionic

covalent

isotonic

hydrogen

Answers

The type of bond that forms between two water molecules is Hydrogen Bond

Which term defines the fact that a forest can only support 50 deer?


A.
carrying capacity


B.
biomass


C.
interspecific competition


D.
intraspecific competition

Answers

It’s A: Carrying capacity. Hope this helped.

Carrying capacity is the term that defines the fact that a forest can only support 50 deer.

Every ecosystem has a certain carrying capacity for each population it supports (different for each species and each type of environment), which is usually indicated by the letter "K".

When a growing population approaches the limit of the ecosystem's carrying capacity, environmental resistance is opposing that growth.

The fact that a forest can only support 50 deer, refers to the carrying capacity this ecosystem has to be able to sustain this population, attending to its minimum needs.

Therefore, we can conclude that carrying capacity is the term that defines the fact that a forest can only support 50 deer as it describes the maximum number of population that a natural area can support without destroying its essential ecological characteristics.

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Stimulants speed up brain and spinal cord activity.
a. True
b. False

Answers

true. due to the fact that they are being stimulated.

Answer:

true

Explanation:

What type of vaccine is the live, weakened measles virus? what type of vaccine is the live, weakened measles virus? attenuated whole-agent vaccine nucleic acid vaccine toxoid vaccine subunit vaccine conjugated vaccine?

Answers

The measles, mumps, and rubella vaccine is the live, weakened measles virus. The vaccine is made from an attenuated form of the virus and combined with protein or small viruses and bacteria extracted from the virus. Nucleic acid vaccine is a vaccine that is attenuated whole-agent vaccine.

Pcr is used to amplify a segment of dna and the enzyme responsible for the replication of dna is

Answers

practis coloring right


Organic matter in soil is also called _____.


loam

talus

humus

regolith

Answers

Answer:

The correct answer would be humus.

Humus is the organic material of the soil formed by the decomposition of the dead plants and animals. It is thick and dark in color (brown or black) and can also be produced by the process of composting.

It is very for the soil as it adds moisture to the soil, enhances the structure of the soil which increases the aeration and drainage.

It favors the growth of organisms (such as earthworm) helpful for the growth of plants and adds lots of nutrients to the soil, specially nitrogen.

In contrast, loam is a type of soil which is composed of silt, sand, and clay in 40-40-20 ratio. Regolith referred to the superficial layer covering the solid rocks or bedrock. It is formed by the accumulation of soil, dust, broken rocks etc on the bedrock.

Lastly, talus referred to the slope which is formed by deposition of shattered rock debris at the base of a cliff.

It is so important in our everyday lives to be able to evaluate if a claim is truly scientifically reliable or not. Often, advertisements will claim to have “proven results”. Can you evaluate if this is a reliable claim or not?

Give an example of 3 questions you can ask yourself to determine if a claim is scientifically reliable or not:

1
2
3

Answers

What is their source? 
- they could be a part of a marketing scam 
- the key question is: how do they know? 
-  Who produced it and what background do they have?
- what other studies could the group have produced?

Is the main point of the claim proven by evidence? 
- In order to figure out if something is reliable or not, you have to ask whether it makes sense and whether the conclusions were proven
- do the conclusions follow logically from what has been cited, or are they being drawn from evidence that doesn't support them at all? 

Do the sources have a bias? 
- That doesn’t necessarily mean what they have to say isn’t reliable
- But think about whether they are a witness to facts or are just describing their opinion

Name four biochemical reactions that can be observed in kia medium

Answers

Four biochemical reactions that can be observed in kia medium are deamination of amino acids, glucose fermentation, lactose fermentation and H2S production.

Cells are largely made of organic compounds that contain carbon. Which property of the carbon atom makes it an essential component of organic compounds?

Carbon is solid at room temperature.

Carbon can form four covalent bonds.

Carbon is a nonmetal.

Carbon oxidizes to carbon dioxide.

Answers

carbon is a non metal

Answer:

I think it might be B

Explanation:

If you search if Carbon can from four covalent bonds it can. And it wont matter if its a non metal and if its solid at room temperature so I think its B. Please correct me if im wrong.

Evidence for the theory that an atom is mostly empty space was supported by research of which of these scientists

Answers

energy change occurring in the atom?

The sun is the ultimate source of energy for terrestrial ecosystems. approximately how much of the potential energy available from the sun s rays hitting the earth is used in photosynthesis? 50% 25% 10% 1%

Answers

its 50% thinvs that eat the plants get 25% and so forth

If potassium channels in a neuron were blocked, would it be possible to produce an action potential?

Answers

Assuming sodium channels are functioning normally, there would still be an action potential. Threshold would be unaffected, because it is a property of sodium channels. A peak voltage will be reached when the sodium channels become inactivated; this voltage may be higher than normal since usually there is a partial canceling of the rising voltage as potassium exits. Without a potassium current, the falling phase would be much slower, being dependent on the sodium-potassium pump removing the sodium ions that came in. The undershoot would be absent because it is a result of potassium current.

Bob davison describes the endangered species act (esa) as an effective tool for conserving biological diversity. what is his rationale for the value of focusing on individual species

Answers

When Bob Davison focuses on individual species as related to the Endangered Species Act (ESA), he accomplishes two tasks. One, he is able to clearly show the decline or growth of a specific group of animals. Two, he is able to appeal to the emotions of potential donors. People are more likely to give money when they can see a specific (preferably cute) animal in duress than if they are just given statistics.

On a nutrition label, what section tells you what is in the food in order from the largest amount to the smallest amount?

Answers

Ingredients section :'p
Final answer:

The Ingredients List on a nutrition label tells you what is in the food in order from the largest amount to the smallest amount, as it lists the ingredients by weight from most to least. The nutrition label also provides information on the macronutrient content (proteins, fats, and carbohydrates) of the food.

Explanation:

By law, food manufacturers are required to list all ingredients in descending order of predominance by weight. This means that the ingredient that weighs the most is listed first, and the ingredient that weighs the least is listed last. For example, if sugar is listed as the first ingredient on a nutrition label, that means there is more sugar in that product than any other ingredient.

In addition to the ingredient listing, the nutrition label also provides information on the macronutrient content (proteins, fats, and carbohydrates) of the food. These macronutrients are broken down further to show the energy content per serving in the form of calories.

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Waves transfer energy by pushing and ______ on neighboring particles

Answers

The correct answer is pushing and pulling on neighboring particles.

Final answer:

Waves transfer energy by pushing and pulling on neighboring particles, where the medium's particles primarily move up and down, emphasizing that waves carry energy and momentum, not mass.

Explanation:

Waves transfer energy by pushing and pulling on neighboring particles. This movement is fundamental in understanding how waves function, contrasting the common misconception that, for instance, water waves push water from one location to another.

In reality, the particles within the medium through which a wave travels (like water) tend to stay in essentially the same location, moving mostly up and down rather than side to side or in the direction of the wave's travel. This movement up and down results from the energy carried by the wave, rather than any significant lateral movement of mass.

This concept underscores that waves can transfer energy and momentum from one location to another without permanently moving mass along with them, serving as a crucial model for the description of various physical phenomena.

How do most small molecules cross the cell membrane?

Answers

Answer:

the structure of the lipid bilayer allows small,uncharged substances such as oxgen.and the carbondioxiode,and hydrophobic moleclues such as lipid to pass through the cell membrane

what would happen to cell division if a chemical was put in the cell that did not allow for cell division to occur

Answers

It would no longer divide, If a chemical that stops cell division is added then cell division could not occur.

If a chemical will put in a cell division during the cell division, cell division will stop.

Cell division:

The ability of a cell to divide further is called cell division. There are two kinds of cell division: mitosis and meiosis.

Mitosis is an equational division while meiosis is a reductional division. Cell division is essential for growth and development of the body. It is divided into prophase, metaphase, anaphase and telophase.

Colchicine is a chemical which stops the cell cycle. Cell cycle is divided into M phase, interphase and S phase.  Tumor suppressor genes are also involved in growth and development of cell

Therefore, If a chemical will put in a cell division during the cell division, cell division will stop.

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A soft, very fine-grained limestone formed via the accumulation of the calcium carbonate remains of microorganisms is known as:

Answers

The organism or product that is being described in the sentence above is chalk. This is the product that is formed with the use of the remains of calcium carbonate. It has a mineral calcite and useful for writing or drawing in smooth and writable surfaces.

Which geochemical cycle involves mantle convection?

Answers

Tectonic ( or plate tectonics)  is the answer!

Answer:

The rock cycle ( including the plate tectonic movement)

Explanation:

The geochemical cycle refers to the transportation of chemical elements from the subsurface region to the surface of the earth. This cyclic process is controlled by the geological and chemical factors.

The rock cycle is one of the type of geochemical cycle which involves the convection current in the mantle.

The earth's crust is comprised of lithospheric plates and the rocks that are present here are made up of numerous chemical elements such as Carbon, Phosphorous, and many more. These plates move over the viscous asthenosphere layer due to the convection current that generates in the mantle. It is due to the radiation of heat energy from the interior of the earth. These plates when moves, share a convergent, divergent and a transform type of plate boundary. As a result of which these chemical elements are also transported along with these plates.

In a convergent plate boundary the denser plate subducts carrying its chemical elements and in a divergent plate boundary, the deep seated rocks with various chemical constituents are carried to the surface forming new crust.

Thus, the rocky cycle plays an important role in carrying the chemical elements by the process of plate motion that generates in the mantle due to the convection current.

You are given a sample of an unknown food. describe how you would test it for the presence of lipids

Answers

you can use the translucent test, lipids leave a translucent trace when smouldered on paper
or you can just use sudan III solution

Final answer:

To test for lipids, place drops of the food samples on labeled areas of brown paper, allow to dry, and check for translucency when held up to light. A translucent spot indicates the presence of lipids.

Explanation:

To test for the presence of lipids in an unknown food sample, follow these steps:

Place a piece of brown paper on a flat surface and draw five circles on it. Label each circle with one of the samples to be tested.

Apply one drop of each food sample onto its respective circle on the brown paper. Use food items such as green banana, black banana, muscle, egg, and DI (distilled water) as control samples.

Allow the paper to dry for at least 15 minutes.

After the paper has dried, hold it up to a light source. If the spot where you applied the food sample is translucent, this indicates that the food contains lipids. This transparency is due to the lipids' ability to absorb pigments in dyes such as Oil Red O or Sudan IV.

Alternative method: Crush a small piece of the food in ethanol, and after allowing the ethanol to evaporate, look for oil stains on the paper as a confirmation of fats or oils.

Record your findings clearly, indicating whether each sample has tested positive or negative for the presence of lipids.

In which phase change does a substance change from a solid to a gas or vapor without changing to a liquid first

Answers

This phase change is called sublimation.

Answer:

Sublimation.

Explanation:

Sublimation may be defined as one of the technique used for the separation of substances from the mixtures of substances. Two solid impurities can be separated by this technique.

The substance is directly changed from the solid phase to the gas phase in sublimation and vice-versa. The liquid state is not involved in the conversion of solid into the gaseous state in case of sublimation.

Thus, the answer is sublimation.

If an organism has a diploid number of 8, how many chromatids are visible at the end of mitotic prophase

Answers

At the end of the mitotic prophase you will get 16 chromatids.
Each chromosome has 2 chromatids and, at this stage, we  still don't have a division to form new cells, that's why it's 2x8 chromosomes. 
In this case 2n = 8 chromosomes.(equals 4 pairs)
A haploid gamete would have four chromosomes.






The highly conserved sequence element present within homeotic genes is called the __________.

Answers

The highly conserved sequence element present within homeotic genes is called the homeobox.

Those members of the population who are capable of developing a disease or condition are known as:

Answers

The answer is "a population at risk".

Answer:

The correct answer is - The population at risk.

Explanation:

The population at risk is the population that is prone or capable of developing a disease or the more likely to exposed by the presence of the event that is vital such as diseases.

The population that are at higher risk for any event that is leads to a condition that decreases or negatively affects the population.

Thus, the correct answer is - the population at risk.

A resident of a long-term care facility has required repeated administration of stool softeners and laxatives to treat recurrent constipation. recently, it was identified that the patient had become impacted, but a residential care aide has documented that this problem resolved because the patient had several watery bowel movements over the past 24 hours. what principle should guide the nurse's subsequent care?

Answers

If a residential care aide has documented that this problem resolved because the patient had several watery bowel movements over the past 24 hours with a history of being impacted. They might assume the resident is still impacted. They might also palpate the abdomen for tenderness and rigidness.
Final answer:

The care for this patient should balance treating constipation and avoiding excessive laxative use to prevent diarrhea. Understanding that watery stools may indicate overflow incontinence, not resolved impaction, is vital. Dietary measures, adequate hydration, regular physical movement, and consideration of additional challenges for the elderly can help maintain healthy bowel function.

Explanation:

The principle that should guide the nurse's subsequent care for this patient is the balance between treating constipation and avoiding the overuse of laxatives, which may lead to a diarrhea or watery bowel movements. This balance is important to maintain the normal water absorption in the colon. Too much of water absorption leads to constipation whereas too little of it results in diarrhea.

It's crucial to understand that watery bowel movements are not a confirmation of the resolution of impaction because they might be due to overflow incontinence around a faecal impaction. Hence, further assessment is needed to ensure complete resolution of fecal impaction. Dietary measures, adequate fluid intake, and regular physical movements can also help in maintaining a healthy bowel movement frequency.

The elderly might face additional challenges like decreased mobility and co-existing neurological conditions affecting their ability to defecate, which should also be considered in the care plan.

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