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4 years ago

How would cellular respiration be impacted in the absence of photosynthesis? Only aerobic respiration would take place.

Biology

2 answers:

MAXImum [283]4 years ago

8 0

I believe that only anaerobic respiration would take place

bogdanovich [222]4 years ago

6 0

The correct answer is 'Only anaerobic respiration would take place'.

Photosynthesis is a biological process through which plants synthesize their own food and oxygen is evolved as a byproduct. With the help of this oxygen living organisms are able to cellular respiration. Electron transport chain is a part of cellular respiration in which oxygen acts as ultimate electron acceptor. If oxygen is not available then a negative feedback loop will stop cellular respiration. But, in the absence of photosynthesis no oxygen will be evolved which means that cellular respiration will not occur. In such circumstances, only anaerobic respiration would take place and only those organisms will survive which are either obligate anaerobes or facultative anaerobes.

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The citric acid is a stage of catabolism that oxidizes acetate into carbon dioxide and generates energy. There are eight enzymes

3241004551 [841]

Answer:

1.(a ) alpha-ketoglutarate dehydrogenase

(c) malate dehydrogenase

(d) isocitrate dehydrogenase

2. b. isocitrate dehydrogenase d. alpha-ketoglutarate dehydrogenase

3. b. citrate synthase (c) succinyl-CoA synthesase

4. b. alpha-ketoglutarate dehydrogenase c. citrate synthase d. malate dehydrogenase

5. a. aconitase

Explanation:

The citric acid cycle is responsible for the oxidation of acetyl-CoA produced from pyruvate from glycolysis. The citric acid cycle has eight steps requiring nine enzymatic reactions involving eight enzymes.

The enzymes in the citric acid cycle are: citrate synthase , aconitase, isocitrate dehydrogenase, alpha-ketoglutarate dehydrogenase , succinyl-CoA synthesase, succinate dehydrogenase , fumarase , and malate dehydrogenase .

1. The dehydrogenation reactions of isocitrate dehydrogenase, alpha-ketoglutarate dehydrogenase , and malate dehydrogenase produces NADH from isocitrate, alpha-ketoglutarate and malate respectively.

2. Oxidative decorboxylation (removal of carbon as CO₂) also occurs in the reactions of isocitrate dehydrogenase and alpha-ketoglutarate dehydrogenase to produce alpha-ketoglutarate and succinyl-CoA respectively.

3. Coenzyme-A (CoA-SH) is produced in the reactions of citrate synthase and succinyl-CoA sythetase to produce citrate and succinate respectively.

4. The enzymes alpha-ketoglutarate dehydrogenase has alpha-ketoglutarate as substrate , whereas citrate synthase and malate dehydrogenase has oxaloacetate as substrate. These substrates are alpha-keto acids.

5. Aconitase catalyzes the conversion of citrate to isocitrate by first a dehydration and then a hydration reaction.

6 0

4 years ago

PLEASE HELP ME ASAP!!!!!!!!!! EVEN IF YOU DONT GIVE ME THE ANSWER TO THIS QUESTION AT LEAST HELP ME UNDERSTAND HOW TO GET THE AN

VikaD [51]

Replacing lysine with aspartic acid is really a change in the primary structure (the sequence of the amino acids - think in a chain). But because they are really different amino acids, the effect is much more profound and will affect the tertiary structure of the protein.

Lysine has a basic, positively charged side chain. Aspartic acid has a negatively charged carboxyl group for its side chain. So, they are two very different amino acids.

Since the tertiary structure of a protein is a result of the interactions of the various interactions of the amino acid side chains, you have to think about what a swap of a basic positive amino acid with a negatively charged amino acid could cause.

For example, if the lysine side chain interacted in ionic interactions (i.e. attraction to a negatively charged amino acid), if you swap it for aspartic acid which is negatively charged it will now repel the other amino acid's side chain and that would disrupt the tertiary structure of the protein. It would also likely cause disruption to the quaternary structure as well.

If this change was in an important part of the protein (e.g. the active site of an enzyme) then it would likely disrupt the proper functioning of this protein.

If you wanted to make the least amount of change to a protein by making a mutation to that lysine amino acid, you would choose other basic amino acids which are histidine and arginine.

3 0

3 years ago

Shape and volume ; Solid : Gas :

choli [55]

Explanation:

=Three states of matter exist – solid, liquid, and gas.

• Solids have a definite shape and volume.

•Liquids have a definite volume, but take the shape of the container.

•Gases have no definite shape or volume.

4 0

3 years ago

Which microorganism is most closely related to plants? cyanobacteria green algae red algae brown algae?

lakkis [162]

green algea are closely related to plants. even though all living organisms that possess chloroplasts originated from cyanobacteria, their evolving order is as follows;The chloroplast of modern plants is thought to have undergone through the following sequence
cyanobacteria→green algea→plants. so it is clear that plants are closely related to green algea because plants evolved from them

3 0

4 years ago

What happens to the two original strands of a dna molecule after the dna has replicated?

iVinArrow [24]

Dna is copied in a cell before a cell divides. Two nucleotide strands of original double helix separate along the strands. ... They move along the DNA molecule breaking the hydrogen bonds between the complementary nitrogen bases. Replication fork- y shaped region that results when two strands separate.

8 0

4 years ago