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3 years ago

In an enzyme-substrate reaction, what does Vmax refer to?

Biology

2 answers:

Varvara68 [4.7K]3 years ago

7 0

A it refers to the speed of the conversion to substrate

agasfer [191]3 years ago

7 0

Answer:

The maximum speed at which substrate is converted to product

Explanation:

Vmax is the maximum value of the initial reaction rate when all active sites are occupied. This point is reached when there is sufficient substrate to completely saturate the active site of the enzyme.

However, it is not proven that it is possible for an enzyme to reach maximum speed in a real reaction due to a short delay during the substrate binding and release process at the active site.

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A neutron star collapses into a black hole because of the force of (fusion,gravity)

stealth61 [152]

Gravity

Neutron stars are the most extreme and fascinating objects known to exist in our universe: Such a star has a mass that is up to twice that of the sun but a radius of only a dozen kilometers: hence it has an enormous density, thousands of billions of times that of the densest element on Earth. An important property of neutron stars, distinguishing them from normal stars, is that their mass cannot grow without bound. Indeed, if a nonrotating star increases its mass, also its density will increase. Normally this will lead to a new equilibrium and the star can live stably in this state for thousands of years. This process, however, cannot repeat indefinitely and the accreting star will reach a mass above which no physical pressure will prevent it from collapsing to a black hole. The critical mass when this happens is called the "maximum mass" and represents an upper limit to the mass that a nonrotating neutron star can be.

However, once the maximum mass is reached, the star also has an alternative to the collapse: it can rotate. A rotating star, in fact, can support a mass larger than if it was nonrotating, simply because the additional centrifugal force can help balance the gravitational force. Also in this case, however, the star cannot be arbitrarily massive because an increase in mass must be accompanied by an increase in the rotation and there is a limit to how fast a star can rotate before breaking apart. Hence, for any neutron star, there is an absolute maximum mass and is given by the largest mass of the fastest-spinning model.

7 0

3 years ago

A zygote consists of how many cells? A. one B. two C. four or five D. eight or ten

valentinak56 [21]

Answer:

Explanation:

3 0

3 years ago

How are plant and animal foods similar and different?

guapka [62]

Similarities being they both reproduce offspring, they provide food for humans, and they both have similar cell structures like ribosomes and the nucleus.

6 0

4 years ago

15. Preservation focuses mainly on preserving resources so that they can be used by people a. True b. False

Semenov [28]

Answer:

b. False

Explanation:

Preservation stands for preserving or sustaining what already exists. aimed at preserving natural resources in their original environment, free from human interference. It stands for securing an object from harm or decay while preserving its nature or state at the same time. Preservation of natural resources does not only benefit humans but also rejuvenates the wildlife and thus gave time for the Earth to breathe and regain its natural form.

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3 years ago

For each of the following 6 scenarios, identify each of the following: unconditioned stimulus, conditioned stimulus, uncondition

KIM [24]

Explanation:

The unconditioned stimulus is a stimulus that naturally, and automatically triggers a response. For example, the smell of your favorite food may make you hungry. The smell is the unconditioned stimulus.

The unconditioned response is the unlearned response that occurs naturally in response to the unconditioned stimulus.

In the example above, the unconditioned response is the hunger felt.

The conditioned stimulus is a previously neutral stimulus that, after becoming associated with the unconditioned stimulus, eventually comes to trigger a conditioned response.

1. An individual receives frequent injections of drugs, which are administered in a small examination room at a clinic. The drug itself causes increased heart rate but after several trips to the clinic, simply being in a small room causes an increased heart rate.

UCS = Injections; UCR = increased Heart Rate caused by drug CS = Small Room similar to the room at the clinic; CR = Increased heart rate.

2. For 3 years Mariah has played her trombone at the school's sports stadium most Friday nights for various sporting events as part of the school's pep band. One Friday night Mariah begins to walk down the school's tall stadium bleachers with her trombone and she trips and falls down several stairs bruising her leg and feelings humiliated as the people around her look at her and some students even laugh. Ever since that incident, each time Mariah walks down the bleacher stairs she looks to see who is around her and her heart rate increases as she nervously walks down the bleacher stairs.

UCS = Being laughed at; UCR = Feeling humiliated; CS = Walking down the bleacher; CR = Heart rate increase and nervousness

3. Before she got her driver’s license, seeing police cars and their flashing red lights did not bother Jaci. But then she started driving and has been pulled over several times for speeding. Each time she was pulled over, first she saw the flashing red lights of the police car. Then she would be questioned by the police and given a ticket, which made her feel very tense and upset. Now whenever she sees a police car with its flashing lights on she feels a little bit nervous, even if it is pulling over someone else.

UCS = Given a Ticket; UCR = Tense and Upset; CS = Seeing any Police Car; CR = Nervousness

4. Frankie eats fried chicken that has e coli in it from her elementary school’s cafeteria and ends up vomiting for hours that night. Luckily, she recovers within a day, but now just the thought of eating food from the school’s cafeteria makes her nauseous.

UCS = Eating chicken with E-Coli; UCR = Vomiting; CS = Thought of eating food; CR = Nausea.

5. At a soccer game, every time the home team scores a goal, the fan behind you screams "GOAL" near your ears causing you to wince. Unfortunately for you, the home team scores frequently. As the end of the game nears, the home team scores a goal, and even though the inconsiderate fan behind you has left, you still wince.

UCS = Scream near ears; UCR = Wince; CS = Fan Shouting every time a goal is scored; CR = Wincing whenever a goal is scored

6. Casey goes outside to play in her tree house. A swarm of bees has nested near her tree house, and she gets stung when she climbs up to the tree house. This happens 3 times in a week. Casey becomes afraid to go near the tree and cries violently when her dad tried to get her to climb up to the tree house.

UCS = Getting stung; UCR = Pain (fear of getting stung); CS = Tree house; CR = Fear of Tree House.

7 0

3 years ago