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vekshin1
3 years ago
9

Please help me out with this!! (Explain) Thank you soo much!! BRAINLIEST TO BEST ANSWER

Biology
2 answers:
WARRIOR [948]3 years ago
6 0

Answer:

C. NAD⁺  

Step-by-step explanation:

NADH is oxidized to NAD⁺ in Complex I of the Electron Transport Chain.

NADH ⟶ NAD⁺ + H⁺ + 2e⁻

The electrons continue through the Electron Transport Chain, and the NAD⁺ is used in three places during the Krebs Cycle.

(a) Isocitrate to oxalosuccinate

Isocitrate + NAD⁺ ⟶ oxalosuccinate + NADH + H⁺

(b) α-Ketoglutarate to succinyl-CoA

α-ketoglutarate + NAD+ + CoA → succinyl CoA + CO₂ + NADH

(c) Malate to oxaloacetate

Malate + NAD⁺  ⟶ oxaloacetate + NADH + H⁺

The NADH produced by these three reactions can then be used by Complex I in the Electron Transport Chain.

Vsevolod [243]3 years ago
5 0

Basic info:

The Krebs cycle, the electron transport chain and respiration (aerobic) are closely related, in fact, the Krebs cycle is part of cellular respiration.

Further info (detailed):

In anaerobic respiration we obtain oxygen, which functions as an electron acceptor in the electron transport chain, which produces NAD+ that is later used in the Krebs cycle to produce NADH and FADH2 that are used as electron carryiers in the ETC.

But, what does the ETC actually do? Why is it so important?

In the ETC, basic substances are produced -  water, ATP and NAD/FAD.

The water and the ATP will be used in many random processes, but the NAD and the FAD are for the Krebs cycle (also glycolysis). During the Krebs cycle, NAD and FAD are used mainly for oxidizing acetyl-CoA to generate energy in the form of NADH and FADH2.

Why does the energy produced by the Krebs cycle come in the form of NADH and FADH2?

Beacuse during the oxidisation of acetyl-CoA (and others) both NAD and FAD react with H+.

Hope it helped,

BioTeacher101

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Which of the following pairs represent homologous structures?
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Complete question:

Which of the following pairs represent homologous structures?

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Answer:

3. Forelimbs of a bat and forelegs of a horse

Explanation:

Homologous characters are structures with the same basic elements. Their position in the body and the relations with adjacent structures are also the same in different organisms, and they even share the same embryological development.

These structures might show variations between the organisms exhibiting them. Variations might be related to their function and to the environment in which the organism lives. The function they accomplish is not necessarily the same in all the organisms involved.

These homologous characters are present in organisms related that share a common ancestor.

For example, whales, humans, and cats all have the same bones in the same order, but they matured differently in later embryological development.

Among the options, the only possible pair that represents homologous characters is option <em>3. Forelimbs of a bat and forelegs of a horse</em>. Both structures are the anterior extremities of the animals and share the same bones, even though they might differ in the development degree. Forelimbs and forelegs have the same position and relation with other structures in the body, and embryologically, they are the same.

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Energy-storing reactions which link simple molecules together to make complex ones

Explanation:

Anabolism or anabolic reactions comprise the process during which simpler molecules are joined or linked to form  complex compounds. These reaction require the input of energy but ultimately that energy is stored in complex molecules for later use.

Organisms employ the reactions which absorb the energy in several reactions. and this absorbed energy is then stored for later use to perform various activities of the body.

For example: Photosynthesis is the common example during which energy from the sun is used to create sugar based molecules like sucrose and glucose. The formation of glucose is an anabolic process because it makes complex compound from simple compounds and stores energy in them which is later used to by plants to perform daily activities and work.

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Q: 18: What are the folds of the inner membrane of mitochondria?

Answer:

Cristae

Explanation:

Cristea are the fodings present in  inner mitochondrial membrane . The reason why there are called cristae came from  Latin word crest that means wrinkled or irregular shape in a way that increases the surface area of the object.

If we look at cristea in mitochondria , its purpose is same, to provide a huge amount of surface area for the diverse types of reactions of cellular respiration that takes place in the inner mitochondrial membrane.

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Q 13: Which statement correctly describe one similarity between cellular respiration and photosynthesis?

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Cellular respiration and photosynthesis both have water and carbon dioxide in the reactions

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The sunlight in mandatory for the execution of photosynthesis however, cellular respiration depends on the supply of glucose and ultimate three phases (glycolysis, kreb cycle and electron transport chain) to transform the glucose in the usable energy reservoir ATP.

But still, when we look at the equations of cellular respiration and photosynthesis, we see something is common. And what is that common thing is,  Cellular respiration and photosynthesis both have water and carbon dioxide in the reactions . (please see attached figure).

In cellular respiration, water and carbon dioxide are the products along with energy, while in photosynthesis water and carbon dioxide are the reactants.


Hope it helps!

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