Question 1

Which of the following best describes the concept of 'linked genes'?

Accepted Answer

Genes located near each other on the same chromosome and tend to be inherited together.

Question 2

During meiosis, crossing over can result in which of the following outcomes?

Accepted Answer

Physical exchange of chromosome segments between homologous chromosomes, increasing genetic diversity.

Question 3

Polyploidy is most commonly found in which type of organism, and what is its significance?

Accepted Answer

Plants; it can result in new species due to extra sets of chromosomes.

Question 4

Which chromosomal rearrangement involves a segment of a chromosome being reversed end to end?

Accepted Answer

Inversion

Question 5

A person with Turner syndrome has which chromosomal abnormality?

Accepted Answer

Monosomy X (only one X chromosome)

Question 6

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

Accepted Answer

$$A$$ pairs with $$T$$ and $$G$$ pairs with $$C$$

Question 7

During DNA replication, which enzyme is responsible for synthesizing the new DNA strand by adding nucleotides to the 3' end?

Accepted Answer

DNA polymerase

Question 8

What is the function of Okazaki fragments during DNA replication?

Accepted Answer

They are short DNA segments synthesized on the lagging strand.

Question 9

Which direction does DNA polymerase synthesize new DNA?

Accepted Answer

From 5' to 3'

Question 10

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

Accepted Answer

Transcription

Question 11

During translation, what is the role of tRNA?

Accepted Answer

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

Question 12

A mutation that changes a codon for an amino acid into a stop codon is called:

Accepted Answer

Nonsense mutation

Question 13

Which of the following best explains a frameshift mutation?

Accepted Answer

A mutation that inserts or deletes nucleotides not in multiples of three, altering the reading frame.

Question 14

Which statement best describes the central dogma of molecular biology?

Accepted Answer

Genetic information flows from DNA to RNA to protein.

Question 15

If a DNA sequence is 5'-ATGCGT-3', what would be the complementary RNA sequence produced during transcription?

Accepted Answer

5'-UACGCA-3'

Question 16

Which enzyme is responsible for joining Okazaki fragments together during DNA replication?

Accepted Answer

DNA ligase

Question 17

A patient is diagnosed with Down syndrome. Which chromosomal abnormality is present?

Accepted Answer

Trisomy 21

Question 18

Which of the following is a consequence of chromosomal translocation?

Accepted Answer

A segment of one chromosome is attached to a non-homologous chromosome, potentially disrupting gene function.

Question 19

Which process is responsible for synthesizing a polypeptide under the direction of mRNA?

Accepted Answer

Translation

Question 20

Which of the following mutations is most likely to result in a nonfunctional protein?

Accepted Answer

Frameshift mutation

Chromosomal Basis of Inheritance, Molecular Basis of Inheritance, and Gene Expression: Study Notes

Study Guide - Practice Questions