Genetics Quiz

The diagram below shows a normal gene sequence and three mutated sequences of a segment of DNA. Which correctly identifies the cause of each type of mutation?

• A) 1

• B) 2

• C) 3

• D) 4

A single gene mutation results from

• A) a change in a base sequence in DNA

• B) recombination of traits

• C) the failure of chromosomes to separate

• D) blocked nerve messages

A DNA nucleotide is composed of

• A) carbon, hydrogen, oxygen, nitrogen, and phosphorus

• B) carbon, hydrogen, nitrogen, sulfur, and calcium

• C) calcium, hydrogen, oxygen, phosphorus, and iron

• D) oxygen, hydrogen, phosphorus, sulfur, and iron

DNA replication occurs in preparation for

• A) mitosis, only

• B) meiosis, only

• C) both mitosis and meiosis

• D) neither mitosis nor meiosis

The molecule DNA contains the four bases listed below. Which base pairings normally occur during DNA replication?

• A) Guanine pairs with cytosine. Thymine pairs with thymine.

• B) Adenine pairs with thymine. Cytosine pairs with guanine.

• C) Thymine pairs with guanine. Cytosine pairs with adenine.

• D) Cytosine pairs with cytosine. Thymine pairs with thymine.

In a cell, protein synthesis is the primary function of

• A) ribosomes

• B) mitochondria

• C) chloroplasts

• D) vacuoles

Base your answer to the following question on the chart below and on your knowledge of biology. Which base sequence of a DNA molecule produces a codon on an mRNA molecule that will allow the amino acid arginine to be incorporated into a protein?

• C – G – A

• G – C – T

• C – G – U

• G – C – U

What is the complementary messenger-RNA sequence for the DNA sequence shown below?

• A – G – G – U

• G – T – T – C – C – A

• G – U – U – C – C – A

• C – A – A – G – G – T

DNA is able to control cellular activities most directly by regulating the process of

• meiotic division

• protein synthesis

• active transport

• selective breeding

Some events that take place during the synthesis of a specific protein are listed below. The correct order of these events is

• B → E → A → C → D

• D → A → E → C → B

• B → C → E → D → A

• C → B → A → E → D