Question 1

Which of the following best describes Chargaff's Rules regarding the composition of DNA?

Accepted Answer

The amount of adenine equals the amount of thymine, and the amount of cytosine equals the amount of guanine.

Question 2

A DNA template strand has the sequence $$5'	ext{-}ATGCGTACG-3'. $$What is the sequence of the complementary daughter DNA strand produced during replication?

Accepted Answer

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

Question 3

Which of the following statements correctly compares DNA and RNA?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 4

During transcription, what is the role of the promoter region in a gene?

Accepted Answer

It provides a binding site for RNA polymerase to start transcription.

Question 5

A point mutation changes a codon from $$GAA to$$ $$GAG in $$the coding region of a gene. Both codons code for glutamic acid. What type of mutation is this?

Accepted Answer

Silent mutation

Question 6

Which process results in the formation of genetically identical daughter cells in humans?

Accepted Answer

Mitosis

Question 7

Which event during meiosis is primarily responsible for increasing genetic diversity among gametes?

Accepted Answer

Crossing over during prophase I

Question 8

A human cell with 47 chromosomes, including three copies of chromosome 21, is best described as having which condition?

Accepted Answer

Down Syndrome (Trisomy 21)

Question 9

Which of the following best describes the difference between homologous chromosomes and sister chromatids?

Accepted Answer

Sister chromatids are identical copies formed during DNA replication, while homologous chromosomes are similar chromosomes inherited from each parent.

Question 10

Which phase of mitosis is characterized by the alignment of chromosomes along the metaphase plate?

Accepted Answer

Metaphase

Question 11

A mutagen is best defined as:

Accepted Answer

A chemical or physical agent that increases the rate of mutation in DNA.

Question 12

Which of the following is a key difference between plant and animal mitosis?

Accepted Answer

Plant cells form a cell plate during cytokinesis, while animal cells form a cleavage furrow.

Question 13

During which phase of meiosis does independent assortment of chromosomes occur?

Accepted Answer

Metaphase I

Question 14

Which of the following best explains why genetic variation is critical for populations?

Accepted Answer

It allows populations to adapt to changing environments through natural selection.

Question 15

A male human with the karyotype $$47,XXY is $$most likely to have which syndrome?

Accepted Answer

Klinefelter Syndrome

Question 16

Which of the following sequences correctly represents the flow of genetic information according to the central dogma of molecular biology?

Accepted Answer

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

Question 17

If a diploid human cell (2n = 46) undergoes meiosis, how many chromosomes will each resulting gamete contain?

Accepted Answer

23

Question 18

Which of the following best describes the outcome of nondisjunction during meiosis?

Accepted Answer

Some gametes have an abnormal number of chromosomes, leading to conditions such as trisomy or monosomy.

Question 19

Which process is responsible for the production of sperm cells in human males?

Accepted Answer

Spermatogenesis

Question 20

A DNA sequence $$3'	ext{-}TACGGTACG-5' is $$transcribed to mRNA. What is the resulting mRNA sequence?

Accepted Answer

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

Cell Division, Genetics, and Chromosomal Inheritance: Study Guide (Chapters 9–14)

Study Guide - Practice Questions

Study Guide - Flashcards