Pre & Post Lab Quizzes

Question 1

What is the smallest unit of heredity?

Answer 1

gene

Question 2

DNA replication is semiconservative process because the ________ strand will remain as half of the ________ molecule.

Answer 2

template, final DNA

Question 3

Which of the following is the amino acid that appears at the N-terminus of all newly translated prokaryotic and eukaryotic polypeptides?

Answer 3

methionine

Question 4

If 30% of the bases within a DNA molecule are adenine, what is the percentage of thymine?

Answer 4

30%

Question 5

Ribosomes are composed of rRNA and what other component?

Answer 5

protein

Question 6

Which of the following types of RNA codes for a protein?

Answer 6

mRNA

Question 7

In DNA, adenine is the complementary base for ________ ,and cytosine is the complement for ________

Answer 7

thymine, guanine

Question 8

According to the central dogma, which of the following represents the flow of genetic information in cells?

Answer 8

DNA to RNA to protein

Question 9

Which of the following is absent in eukaryotes, but present in prokaryotes?

Answer 9

simultaneous transcription and translation

Question 10

Serratia marcescens cells produce a red pigment at room temperature. The red color of the colonies is an example of which of the following?

Answer 10

phenotype

Question 11

Which of the following components is involved in the initiation of transcription?

Answer 11

promoter

Question 12

Which of the following correctly explains why DNA replication is described as semiconservative?

Answer 12

Each daughter strand contains one old strand and one new strand.

Question 13

DNA polymerase catalyzes the synthesis of DNA in the

Answer 13

5’ to 3’ direction

Question 14

A DNA nucleotide contains which of the following?

Answer 14

a deoxyribose sugar, a phosphate, and a nitrogenous base

Question 15

Which of the following is not a difference between DNA and RNA?

Answer 15

DNA is used for shorter-term functions than RNA.

Question 16

The Shine-Dalgarno sequence is

Answer 16

a short sequence that acts as a ribosomal binding site

Question 17

Which of the following correctly describes the number and type of bond(s) that stabilize an adenine–thymine base pair?

Answer 17

two hydrogen bonds

Question 18

Evidence that DNA was the genetic material rather than protein was provided by which of the following?

Answer 18

Hershey and Chase

Question 19

The final step in gene expression is protein synthesis, or

Answer 19

translation

Question 20

One strand of DNA runs from 5′ to 3′ and the opposing strand runs 3′ to 5′, meaning that the strands are oriented in which way?

Answer 20

antiparallel

Question 21

The enzyme that catalyzes the synthesis of DNA is called

Answer 21

DNA polymerase

Question 22

Which of the following is the function of the σ factor?

Answer 22

It allows RNA polymerase to recognize a specific promoter in prokaryotes.

Question 23

The chromosome of almost all bacteria is in the shape of

Answer 23

a closed circle

Question 24

The concept of chemical evolution is based on

Answer 24

the possible origin of life by the combination of chemicals under suitable environmental conditions

Question 25

A nonsense mutation results in

Answer 25

a premature termination of the synthesis of a polypeptide

Question 26

The theory which suggests that life existed in outer space and was transported by meteorites, asteroids, or comets to a receptive Earth?

Answer 26

Panspermia

Question 27

What did Stanley Miller produce in his synthesis experiment?

Answer 27

Amino acid

Question 28

Life originated on earth about _____

Answer 28

4 billion years ago

Question 29

Which of the following is an example of a frameshift mutation?

Answer 29

deletion of one nucleotide

Question 30

The transport of bacterial DNA to other bacteria via bacteriaphages is called

Answer 30

transduction

Question 31

Horizontal transfer can best be described as:

Answer 31

the transmission of genetic information from one independent, mature organism to another

Question 32

Which of the following refers to the uptake of naked DNA from the surrounding environment?

Answer 32

transformation

Question 32

Life first originated in ______

Answer 32

water