Question 1

Which of the following best describes the function of the nucleolus within the nucleus?

Accepted Answer

It is responsible for synthesizing ribosomal RNA (rRNA) and assembling ribosomal subunits.

Question 2

A mature red blood cell is unique among most cells because it:

Accepted Answer

Has no nucleus, allowing more space for hemoglobin.

Question 3

Which statement correctly describes the relationship between chromatin and chromosomes?

Accepted Answer

Chromosomes are the highly condensed form of chromatin visible during mitosis.

Question 4

Which of the following is TRUE regarding the nuclear envelope?

Accepted Answer

It is continuous with the endoplasmic reticulum and contains nuclear pores for transport.

Question 5

What is the primary role of nuclear pores in the nuclear envelope?

Accepted Answer

To facilitate active transport of RNA out of the nucleus and proteins/chemical messengers in and out.

Question 6

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

Accepted Answer

A phosphate group, a pentose sugar, and a nitrogen-containing base.

Question 7

Which type of chemical bond connects adjacent nucleotides in a single strand of DNA?

Accepted Answer

Phosphodiester bond

Question 8

In the double helix structure of DNA, which base pairs with guanine?

Accepted Answer

Cytosine

Question 9

Which of the following is a correct representation of the antiparallel orientation of DNA strands?

Accepted Answer

$$5'\rightarrow3'$$ and $$3'\rightarrow5'$$

Question 10

Which of the following is NOT a function of the nucleus?

Accepted Answer

Producing ATP for cellular energy

Question 11

Which of the following statements about the human genome is correct?

Accepted Answer

It is spread across 23 chromosomes, with only 2% coding for genes.

Question 12

During mitosis, what is the function of the kinetochore?

Accepted Answer

It serves as the attachment point for microtubule fibers to pull sister chromatids apart.

Question 13

Which of the following correctly matches the type of RNA with its function?

Accepted Answer

mRNA: carries genetic information from the nucleus to ribosomes

Question 14

Which process describes the synthesis of RNA from a DNA template?

Accepted Answer

Transcription

Question 15

If a DNA sequence is $$3'-AGCTTTCG-5'$$, what is the complementary RNA sequence produced during transcription?

Accepted Answer

$$5'-UCGAAAGC-3'$$

Question 16

Which of the following best describes the central dogma of cell biology?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 17

Which of the following is a correct example of a triplet codon in mRNA and its corresponding amino acid?

Accepted Answer

AUG: Methionine

Question 18

Which of the following statements about phosphodiester bonds is correct?

Accepted Answer

They link the 5' phosphate group of one nucleotide to the 3' hydroxyl group of the next.

Question 19

A mutation changes a DNA base from adenine to cytosine. Which type of base pairing will be affected?

Accepted Answer

Adenine normally pairs with thymine, so the mutation will disrupt A=T hydrogen bonding.

Question 20

Which of the following is a real-world consequence of a mutation in a gene encoding for mRNA?

Accepted Answer

The cell will produce a protein with an altered amino acid sequence, potentially leading to disease.

Cells & Genetics: Structure and Function of the Nucleus, Chromatin, Chromosomes, Nucleolus, and Genetic Code

Study Guide - Practice Questions