$$\text{Nucleotide}_1 + \text{Nucleotide}_2 \rightarrow \text{Dinucleotide} + H_2O$$

Question 1

Which statement best describes the principle of 'continuity of life' as it relates to cell reproduction?

Accepted Answer

All cells come from pre-existing cells, ensuring genetic continuity.

Question 2

What is the basic structural unit of nucleic acids such as DNA and RNA?

Accepted Answer

Nucleotide

Question 3

Which type of bond links nucleotides together in a single strand of DNA?

Accepted Answer

Phosphodiester bond

Question 4

A DNA molecule is described as 'antiparallel.' What does this mean?

Accepted Answer

One strand runs 5' to 3', while the other runs 3' to 5'.

Question 5

Which of the following correctly represents complementary base pairing in DNA?

Accepted Answer

Adenine pairs with thymine, guanine pairs with cytosine

Question 6

During DNA replication, which direction does DNA polymerase synthesize the new strand?

Accepted Answer

From the 5' end to the 3' end

Question 7

Which feature of the DNA double helix allows for accurate replication?

Accepted Answer

Complementary base pairing via hydrogen bonds

Question 8

What is the main difference between DNA and RNA nucleotides?

Accepted Answer

DNA contains thymine, RNA contains uracil

Question 9

Which process is responsible for repairing errors that occur during DNA replication?

Accepted Answer

DNA repair mechanisms

Question 10

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

Accepted Answer

3'-TAGC-5'

Question 11

Which equation best represents the condensation reaction that forms a phosphodiester bond between two nucleotides?

Accepted Answer

$$	ext{Nucleotide}_1 + 	ext{Nucleotide}_2 ightarrow 	ext{Dinucleotide} + H_2O$$

Question 12

Which of the following is a real-world consequence of errors in DNA replication?

Accepted Answer

Genetic mutations that may lead to diseases such as cancer

Question 13

Why can RNA form complex secondary and tertiary structures, while DNA typically does not?

Accepted Answer

RNA can base pair within a single strand, forming loops and helices

Question 14

Which scientist(s) are credited with determining the double helix structure of DNA?

Accepted Answer

Watson and Crick

Question 15

A mutation changes a cytosine (C) to a thymine (T) in a DNA sequence. What type of base pairing will now occur at this position?

Accepted Answer

Thymine will pair with adenine

Question 16

Which property of the sugar-phosphate backbone gives nucleic acid strands their structural polarity?

Accepted Answer

The presence of a 5' phosphate and a 3' hydroxyl group

Question 17

In a DNA double helix, what would be the expected percentage of guanine if cytosine makes up 25% of the bases?

Accepted Answer

25%

Question 18

Which of the following best explains why only purine-pyrimidine pairs fit inside the DNA double helix?

Accepted Answer

Purine-pyrimidine pairs have the correct size and spacing for stable hydrogen bonding

Question 19

Which of the following is NOT a function of nucleic acids in living cells?

Accepted Answer

Providing structural support to cell membranes

Continuity of Life: DNA Structure and Replication

Study Guide - Practice Questions