$$\text{Phosphate} - \text{Ribose} - \text{Uracil}$$

$$\text{A} + \text{T}$$ and $$\text{G} + \text{C}$$

Question 1

Which of the following best describes the structure of a nucleotide found in DNA?

Accepted Answer

A phosphate group, a deoxyribose sugar, and a nitrogenous base

Question 2

Which equation correctly represents the formation of a phosphodiester bond between two nucleotides?

Accepted Answer

$$\mathrm{Nucleotide}_1 + \mathrm{Nucleotide}_2 \rightarrow \mathrm{Nucleotide}_1{-}P{-}O{-}\mathrm{Nucleotide}_2 + H_2O$$

Question 3

Which nitrogenous base is found in RNA but not in DNA?

Accepted Answer

Uracil

Question 4

A scientist isolates a nucleic acid sample and finds it contains deoxyribose sugar and thymine. What type of nucleic acid is this?

Accepted Answer

DNA

Question 5

Which of the following best explains the role of codons in genetic information?

Accepted Answer

Codons are sequences of three nucleotides that specify amino acids during protein synthesis

Question 6

If a DNA strand has the sequence 5'-ATCG-3', what is the complementary sequence?

Accepted Answer

3'-TAGC-5'

Question 7

Which of the following statements about the difference between DNA and RNA is correct?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar

Question 8

Which of the following is a correct representation of a nucleotide found in RNA?

Accepted Answer

$$	ext{Phosphate} - 	ext{Ribose} - 	ext{Uracil}$$

Question 9

During DNA replication, which enzyme is responsible for joining Okazaki fragments on the lagging strand?

Accepted Answer

DNA ligase

Question 10

A mutation changes the codon AAA to AAT in a gene. What is the most likely effect on the protein produced?

Accepted Answer

The amino acid sequence may change, potentially altering protein function

Question 11

Which of the following best describes the backbone of a DNA molecule?

Accepted Answer

Alternating phosphate and deoxyribose groups

Question 12

Which process uses the information in DNA to synthesize RNA?

Accepted Answer

Transcription

Question 13

Which of the following is NOT a component of a nucleotide?

Accepted Answer

Fatty acid

Question 14

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

Accepted Answer

DNA contains deoxyribose, which lacks a hydroxyl group at the 2' carbon, making it less reactive

Question 15

Which of the following equations represents the base pairing in DNA?

Accepted Answer

$$	ext{A} + 	ext{T}$$ and $$	ext{G} + 	ext{C}$$

Question 16

A cell is observed to have a nucleus, DNA, and membrane-bound organelles. What type of cell is this?

Accepted Answer

Eukaryotic cell

Question 17

Which of the following is the correct sequence of events in the central dogma of molecular biology?

Accepted Answer

DNA $$\rightarrow$$ RNA $$\rightarrow$$ Protein

Question 18

Which of the following is a real-world application of understanding codons and genetic code?

Accepted Answer

Designing gene therapies to correct genetic disorders

Question 19

Which of the following best describes the shape of a DNA molecule?

Accepted Answer

Double helix

Question 20

Which of the following is a function of RNA in the cell?

Accepted Answer

Carrying genetic information from DNA to ribosomes for protein synthesis

Nucleic Acids: Structure and Function in Cells

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