Q: Which of the following best describes the flow of genetic information in a eukaryotic cell according to the central dogma of molecular biology?

$$\text{DNA} \rightarrow \text{mRNA} \rightarrow \text{Protein}$$

Q: If a DNA strand has the sequence $$5'\text{-}ATCGGTA\text{-}3'$$, what is the sequence of its complementary strand?

$$3'\text{-}TAGCCAT\text{-}5'$$

Q: In a DNA double helix, if one strand has the sequence $$5'\text{-}GATTACA\text{-}3'$$, what is the sequence of the complementary strand (written $$5' to$$ $$3'$$)?

$$5'\text{-}TGTAATC\text{-}3'$$

Question 1

Which of the following best describes the flow of genetic information in a eukaryotic cell according to the central dogma of molecular biology?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{mRNA} ightarrow 	ext{Protein}$$

Question 2

A scientist discovers a nucleic acid molecule with the following characteristics: it contains uracil, is usually single-stranded, and has ribose as its sugar. What type of molecule is this?

Accepted Answer

RNA

Question 3

Which of the following statements about the structure of DNA is correct?

Accepted Answer

Adenine pairs with thymine via hydrogen bonds.

Question 4

Which of the following components is NOT part of a nucleotide?

Accepted Answer

A carboxyl group

Question 5

If a DNA strand has the sequence $$5'	ext{-}ATCGGTA	ext{-}3'$$, what is the sequence of its complementary strand?

Accepted Answer

$$3'	ext{-}TAGCCAT	ext{-}5'$$

Question 6

Which of the following best explains why DNA replication is essential before cell division?

Accepted Answer

It ensures that each daughter cell receives an exact copy of the genetic material.

Question 7

Which of the following bonds links nucleotides together in a polynucleotide chain?

Accepted Answer

Phosphodiester bonds

Question 8

A mutation changes a cytosine (C) in DNA to a thymine (T). Which type of nitrogenous base has been altered?

Accepted Answer

A pyrimidine to another pyrimidine

Question 9

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

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose.

Question 10

During protein synthesis in eukaryotic cells, what is the role of mRNA?

Accepted Answer

It carries genetic instructions from the nucleus to the cytoplasm.

Question 11

Which of the following best describes a nucleoside?

Accepted Answer

A nitrogenous base and a pentose sugar

Question 12

A researcher is analyzing a nucleic acid and finds that it contains equal amounts of adenine and thymine, and equal amounts of guanine and cytosine. What can be inferred about the structure of this molecule?

Accepted Answer

It is likely a double-stranded DNA molecule.

Question 13

Which carbon of the pentose sugar in a nucleotide is bonded to the phosphate group in the sugar-phosphate backbone?

Accepted Answer

$$5'$$ carbon

Question 14

In a DNA double helix, if one strand has the sequence $$5'	ext{-}GATTACA	ext{-}3'$$, what is the sequence of the complementary strand (written $$5' to$$ $$3'$$)?

Accepted Answer

$$5'	ext{-}TGTAATC	ext{-}3'$$

Question 15

Which of the following is a correct statement about the antiparallel nature of DNA?

Accepted Answer

One strand runs $$5' to$$ $$3'$$, and the other runs $$3' to$$ $$5'.$$

Question 16

Which of the following best explains why the sequence of nitrogenous bases in DNA is important?

Accepted Answer

It determines the order of amino acids in a protein.

Question 17

A patient is diagnosed with a genetic disorder caused by a mutation in a single gene. Which molecule is most directly affected by this mutation during protein synthesis?

Accepted Answer

The sequence of mRNA transcribed from the gene

Question 18

Which of the following is a purine base found in both DNA and RNA?

Accepted Answer

Adenine

Question 19

If a DNA molecule is treated with an enzyme that breaks hydrogen bonds, what is the most immediate effect?

Accepted Answer

The two strands of the double helix will separate.

Question 20

Which of the following best describes the role of tRNA during translation?

Accepted Answer

It carries amino acids to the ribosome and matches them to the coded mRNA message.

Nucleic Acids: Structure, Function, and Genetic Information Flow

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