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Multiple Choice Quiz
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1

A ______ gene codes for a repressor protein.
A)promoter
B)operator
C)structural
D)regulator
E)transcription
2

The promoter is ___________.
A)a short sequence of DNA where the repressor binds, preventing RNA polymerase from attaching to the promoter
B)a short sequence of DNA where RNA polymerase first attaches when a gene is to be transcribed
C)one to several genes of a metabolic pathway that are transcribed as a unit
D)a gene that codes for a repressor protein
E)any dominant gene
3

Each cell contains a full complement of genes but only certain genes are active at any one time.
A)True
B)False
4

A regulator gene located inside the operon codes for a promoter protein that can bind to the operator and switch on the operon.
A)True
B)False
5

The operon model explains a means of transcriptional control in bacteria.
A)True
B)False
6

Which of the following is NOT true concerning control of gene expression in eukaryotic cells?
A)Transcriptional control is the most important factor.
B)Transcription factors help RNA polymerase bind to a promoter.
C)Transcription activators binding to enhancers can speed up transcription.
D)Part of transcriptional control includes the processing of mRNA before it leaves the nucleus.
E)All of the above are correct.
7

All mRNA molecules exist for the same amount of time within a cell.
A)True
B)False
8

Which of the following is NOT true regarding protein activity?
A)All proteins are active immediately after being formed.
B)Proteasomes are protein complexes responsible for degrading proteins.
C)Proteins will fold into a three dimensional structure after being synthesized.
D)Some amino acids may need to be removed before a protein becomes functional.
E)Protein activity is usually controlled by feedback control.
9

Ordinarily, cells with damaged DNA undergo ______ or programmed cell death.
A)apoptosis
B)tumor-suppression
C)differentiation
D)angiogenesis
E)metastasis
10

Cancer cells exhibit uncontrolled and disorganized growth.
A)True
B)False
11

Formation of new blood vessels is required to bring nutrients and oxygen to cancerous tumors.
A)True
B)False
12

Cancer cells cannot enter the cell cycle and therefore are mortal.
A)True
B)False
13

______ are cancer-causing genes.
A)Metastases
B)Mutagens
C)Carcinogens
D)Oncogenes
E)Homozygous recessive genes
14

A cell contains many ___________ where one mutation can cause them to become oncogenes.
A)metastases
B)tumor-suppressor
C)benign tumors
D)proto-oncogenes
E)carcinogens
15

Proto-oncogenes promote the cell cycle and _____ genes inhibit the cell cycle.
A)recessive
B)tumor-suppressor
C)benign
D)proto-oncogenes
E)carcinogens
16

Which of these characteristics is typical of cancer cell?
A)Cancer cells lack contact inhibition.
B)Cancer cells induce angiogenesis.
C)Cancer cells lack specialization.
D)Cancer cells can metastasize.
E)All of these are correct
17

A ________ is an environmental agent that can contribute to the development of cancer.
A)mutagen
B)fibrinogen
C)carcinogen
D)factor
18

Some examples of carcinogens are _________.
A)certain organic chemicals
B)radiation
C)viruses
D)All of these are correct
19

Which DNA virus has been linked to a type of human cancer?
A)hepatitis B virus
B)human papillomavirus
C)Epstein-Barr virus
D)All of the above.
20

The pap smear is a test for ________ cancer.
A)colon
B)cervical
C)breast
D)ovarian
E)liver
21

The standard methods of treatment for cancer are _________.
A)surgery
B)radiation
C)chemotherapy
D)All of the above
22

Most chemotherapy drugs kill cells by damaging ___________.
A)DNA
B)protein
C)nearby blood vessels
D)the cell membrane
E)All of the above





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