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3 years ago

List the products of the Krebs cycle. what happens to each of these products

Biology

2 answers:

dybincka [34]3 years ago

7 0

The products of the Krebs cycle (cellular respiration) is:
Pyruvic acid is broken down

slamgirl [31]3 years ago

3 0

The products are ATP, NADH, FADH2, and CO2. CO2 is expelled in inhalation. ATP molecules are used to power cellular activities. The NADH and FADH2 molecules are used in the electron transport chain to generate ATP.

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Suppose that of a cohort of 200 rats in a rat colony born in January, 160 are still alive at the start of March and 120 are stil

asambeis [7]

Survivorship is the probability that individuals from the original cohort (age 0) get to a certain age (age x). Survivorship up to the start of March is 0.8.

<h3>What is a life table?</h3>

It is a representation of life and death patterns in a cohort. It includes the probability for different organisms in the population to live, survive, reproduce or die.

It is composed of information provided by parameters like age structure, natality rate, and death rate per age concerning the whole population.

There are two types of life tables:

Horizontal life table
Vertical life table

<h3>What is the horizontal life table?</h3>

This is a representation of a cohort destiny, from the born moment to the death moment of all individuals, including survival and fecundity per age.

A cohort is a group of individuals of the same age that are incorporated into the population at the same time.

This table is based on different vital statistics. Among them, we can mention,

Number of individuals registered at a certain age, N(x)

Number of individuals at initial age (recent born, seeds, propagule), N(0)

Specific survivorship per age, l(x)

Transition rate from one age to the next one, p(x)

The proportion of the original cohort that dies during a certain age x, d(x)

Specific mortality per age, q(x)

Specific survivorship per age, l(x), is the proportion of individuals from the original cohort that gets to survive reaching a certain age. It is the probability that a recent born gets to a certain age.

l(x) = N(x) / N(0)

Values must go from <u>0 to 1</u>. By definition, when l(x) = 1, then X = 0

In the exposed example, we know that

N(0) = 200 rats ⇒ new borns
N(x) = 160 rats ⇒ three months individuals

l(x) = N(x) / N(0)

l(x) = 160 / 200 = 0.8

Survivorship specific per age up to the start of March is<u> 0.8 = 80%</u>

You can learn more about life tables at

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6 0

2 years ago

Which of the following correctly compares the changes that take place in an ecosystem during primary succession and secondary su

n200080 [17]

Answer: B). Primary succession takes place over a long period of time on a newly formed land, while secondary succession occurs quickly in areas that have disrupted by a natural disaster.

Explanation:

A succession is a gradual change that occur within the biotic community due to change in the non-living environmental factors with respect to time until the community establish stability.

A primary succession occurs over a land which was not previously occupied by any living species. The land can be primitive, environmental factors like soil, air and others are not supportive initially. Thus, it takes long time to establish a biotic community.

A secondary succession occurs over a region which was previously inhabitated by colonies of species but disturbed due to natural calamity or human induced disaster. Some of the precursors of life can be found in such region like seeds, spores, roots and others which support new growth and the environmental factors are suitable to support re-establishment of living species. Hence, secondary succession takes place quickly as compared to primary succession.

3 0

3 years ago

Read 2 more answers

3.How have scientists' ideas of human evolution changed over time<br><br> Please Hurry

Alex

Answer:

They once thought that humans came from monkeys and apes but now they think they come from a ancient ancestor not from the monkey or ape family.

Explanation:

5 0

3 years ago

If you removed the tertiary consumers from a food web, what would be the response of the primary consumers

ki77a [65]

The secondary consumers would be overpopulated with no one to consume them. Then the primary consumers will decrease.

7 0

4 years ago

Read 2 more answers

Researchers isolated a yeast phosphofructokinase mutant in which a serine at the fructose-2,6-bisphosphate (F26BP) binding site

ivann1987 [24]

Answer:

Explanation:

Phosphofructokinase-1, also known as the glycolysis stimulator, is among the most important glycolysis regulatory enzymes. It's an apoptotic enzyme with effectors (activators/inhibitors) that control its activity. Fructose 6-phosphate and ATP are converted to fructose 1,6-bisphosphate and ADP by PFK-1.

Suppose the serine in PFK's active site is substituted with aspartic acid, the enzyme's active site would be devoid of phosphorylation sites. The enzyme PFK contributes to the transferase family since it has kinase activity. It serves as an acceptor by transferring phosphorus groups to an alcohol group (serine).

Insulin stimulates protein phosphatase, which eliminates the phosphate group from the serine residue, stabilizing the kinase role and promoting F26BP formation. The phosphorylation reaction will not take place provided the serine is substituted with aspartic acid. Therefore, the PFK's kinase activity will be lost. Similarly, F26BP will not form PFK, and it will not be aborted in the future.

Their decline reveals that:

F26BP increases the overall net flow of glucose by glycolysis modulates PFK production and induces Fructose 1,6 bis phosphatase, which also catalyzes the glycolysis reverse process.

Fructose-2,6-bisphosphate transcriptionally activates the rate-limiting process of glycolysis catalyzed by PFK 1.

Increased levels of Fru-2,6-P2 located in the liver raise PFK1's propensity and resistance for fructose 6 phosphate while lowering its affinity for its' inhibitors ATP and citrate.

Fructose 2,6-bisphosphate supersedes the inhibition of ATP and promotes greater sensitivity of the eukaryotes to be regulated by hormones (glucagon and insulin).

8 0

3 years ago