GATE ES Cell chemistry and cell biology PYQs & Answers

Questions 1–5 of 5. Imported answers require independent review unless marked reviewed.

Which ONE of the following options is CORRECT with respect to sequential breakdown of deoxyribonucleic acid (DNA) into lower-molecular weight compounds?

Your answerChoose one option.

Deoxyribonucleic acid → 2-deoxyribose → Nucleosides → Nucleotides

Deoxyribonucleic acid → 2-deoxyribose → Nucleotides → Nucleosides

Deoxyribonucleic acid → Nucleotides → Nucleosides → 2-deoxyribose

Deoxyribonucleic acid → Nucleosides → Nucleotides → 2-deoxyribose

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Which of the following statement(s) is/are CORRECT?

Your answerSelect all correct options. You can choose more than one.

DNA is composed of nucleotides.

Five types of nitrogenous bases occur in DNA.

Each phosphate is attached to two deoxyribose units in a single strand of DNA.

The ratio of adenine to guanine is always 1:1 in a double stranded DNA.

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Read the following statements

I. Photosynthesis takes place within the chloroplasts of the eukaryotes, where the breakdown of complex molecules to yield energy takes place in the cytoplasm and in the mitochondria.

II. Photosynthesis takes place within the chloroplasts of the prokaryotes, where the breakdown of complex molecules to yield energy takes place in the cytoplasm and in the mitochondria.

III. All living organisms retain the enzymatic machinery to partially oxidise glucose without the help of oxygen. This breakdown of glucose to pyruvic acid is called glycolysis.

IV. All living organisms retain the enzymatic machinery to completely oxidise glycerol without the help of oxygen. This breakdown of glycerol to citric acid is called glycolysis.

The correct choice is

Your answerChoose one option.

I and III are correct

II and IV are correct

I is correct whereas III is incorrect

II is correct whereas IV is incorrect

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A typical plasmid-free bacterial cell having a single chromosome consists of ~55% protein, ~3% DNA and ~21% RNA, where “%” represents percentage of dry weight. Assuming there are 250 different types of protein molecules (with at least one copy number) being expressed in a living bacterial cell at any given time, which of the following statement(s) are NOT correct with respect to the number of intracellular DNA, RNA and protein molecules?

Your answerSelect all correct options. You can choose more than one.

DNA = RNA = Protein ≥ 250

DNA = RNA = 1; Protein ≥ 250

DNA = 1; RNA = Protein ≥ 250

DNA = 1; RNA > Protein ≥ 250

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Which of the following pairing of nucleotide bases is present in double helix DNA?

Your answerChoose one option.

Thymine - Cytosine

Adenine - Thymine

Cytosine - Adenine

Uracil - Thymine

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GATE ES Cell chemistry and cell biology PYQs

How to practice Cell chemistry and cell biology

Question 38

Question 45

Question 15

Question 44

Question 18