Q: Which of the following equations correctly represents the hydrolysis of ATP to ADP?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P_i} + \text{Energy}$$

Question 1

Which of the following best describes the structural difference between a nucleotide and a nucleoside?

Accepted Answer

A nucleotide contains a nitrogenous base, a pentose sugar, and a phosphate group, while a nucleoside contains only a nitrogenous base and a pentose sugar.

Question 2

Which bond is responsible for linking nucleotides together in the backbone of DNA and RNA?

Accepted Answer

Phosphodiester bond

Question 3

Which of the following statements about the directionality of nucleic acids is correct?

Accepted Answer

Nucleic acids are synthesized and read from the 5' to 3' direction.

Question 4

Which of the following best explains why DNA is more stable than RNA under physiological conditions?

Accepted Answer

DNA lacks a 2'-hydroxyl group on its sugar, making it less prone to hydrolysis.

Question 5

Which of the following equations correctly represents the hydrolysis of ATP to ADP?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{Energy}$$

Question 6

Which of the following base pairs is stabilized by three hydrogen bonds in double-stranded DNA?

Accepted Answer

Guanine–Cytosine

Question 7

A mutation replaces a cytosine with a thymine in a DNA strand. What is the most direct effect on the DNA double helix?

Accepted Answer

The number of hydrogen bonds between the affected base pair decreases from three to two.

Question 8

Which of the following modifications is commonly found in eukaryotic DNA and is important for epigenetic gene regulation?

Accepted Answer

5-Methylcytidine

Question 9

Which enzyme catalyzes the formation of cAMP from ATP in response to hormonal signals?

Accepted Answer

Adenylyl cyclase

Question 10

Which of the following best describes the role of tRNA during protein synthesis?

Accepted Answer

tRNA brings amino acids to the ribosome and matches them to the mRNA codon.

Question 11

Which of the following is a key feature of the Watson-Crick model of DNA?

Accepted Answer

The two DNA strands are antiparallel and held together by complementary base pairing.

Question 12

Which of the following statements about DNA denaturation is correct?

Accepted Answer

Denaturation breaks hydrogen bonds between base pairs, but the genetic code remains intact.

Question 13

Which of the following factors increases the melting temperature ($$T_m) of $$DNA?

Accepted Answer

Increasing the proportion of GC base pairs

Question 14

Which of the following is a function of ribosomal RNA (rRNA)?

Accepted Answer

Catalyzing the formation of peptide bonds during translation

Question 15

Which of the following best describes the difference between purines and pyrimidines?

Accepted Answer

Purines have a double ring structure, while pyrimidines have a single ring structure.

Question 16

Which of the following is a real-life application of the polymerase chain reaction (PCR)?

Accepted Answer

Amplifying specific DNA sequences for genetic testing

Question 17

Which of the following best explains why the anti conformation of the N-glycosidic bond is favored in DNA?

Accepted Answer

It allows proper base pairing and stacking interactions within the double helix.

Question 18

Which of the following is a consequence of incorporating a dideoxynucleotide (ddNTP) during DNA sequencing?

Accepted Answer

The DNA strand is terminated at the point of ddNTP incorporation.

Question 19

Which of the following is a function of micro-RNAs (miRNAs) in cells?

Accepted Answer

Regulating gene expression by binding to mRNA and inhibiting translation

Nucleotides and Nucleic Acids: Structure, Function, and Biological Roles

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