Exam 4 Clicker

Question 1

A mutation acquired by a bacterium will very likely be inherited by all daughter cells.
True
False

Answer 1

True

Question 2

Which DNA sequences are more alike?
A pair of sister chromatids
A pair of homologous chromosomes
Human chromosomes 1 and 2

Answer 2

A pair of sister chromatids

Question 3

A skin cell in G2 of interphase has ____ as much DNA as it had in G1
Half
Twice
Exactly
One-fourth
Four times

Answer 3

Twice

Question 4

All of the following happen during mitosis except:
Condensing of chromosomes
Separation of sister chromatids at the centromeres
Formation of the spindle
Synthesis of DNA

Answer 4

Synthesis of DNA

Question 5

What would happen during cell division if the cell was deficient in action?
The sister chromatids would not separate
The mitosis spindle would not form
The cell would not divide
The centromeres would remain unattached

Answer 5

The cell would not divide

Question 6

Synapsids occurs during
Prophase of mitosis
Metaphase of mitosis
Anaphase II of mitosis
Prophase I of meiosis
Prophase II of meiosis

Answer 6

prophase I of meiosis

Question 7

Mutationally activated Ras is an example of
A protocol-oncogene
An oncogene
A tumor suppressor
A CDK
Two of the above are correct

Answer 7

An oncogene

Question 8

Cell division signal has activated a cell. New cells required immediately! What happens?
Cell destruction
Cell division
Cell growth
Chromosome duplication
Chromosome separation

Answer 8

Cell growth

Question 9

Cell grows and the first checkpoint is passed. Next Step?
Cell destruction
Cell division
Cell growth
Chromosome duplication
Chromosome separation

Answer 9

Chromosome duplication

Question 10

DNA copied. Next Step?
Cell destruction
Cell division
Cell growth
Chromosome duplication
Chromosome separation

Answer 10

Cell growth

Question 11

Which checkpoints must be passed in G2 and M phase?
DNA damage
Replication
Spindle Assembly

Answer 11

Replication
Spindle assembly

Question 12

What’s next after the checkpoints have passed?
Cell destruction
Cell division
Cell growth
Chromosome duplication
Chromosome separation

Answer 12

Chromosome separation

Question 13

Chromosomes have separated. Next Step?
Cell destruction
Cell division
Cell growth
Chromosome duplication
Chromosome separation

Answer 13

Cell division

Question 14

Given that undamaged DNA is vital to the proper functioning of a cell, what options does a cell have if it detects DNA damage at the DNA damage checkpoint?
The cell copies its chromosomes and enters G2
The cell returns to M phase
The cell dies
The cell fixes the damage then enters S phase

Answer 14

The cell dies
The cell fixes the damage then enters S phase

Question 15

A cell dies in apoptosis because
White blood cells digest it
It has been injured
It has swelled and burst
It is programmed to die

Answer 15

It is programmed to die

Question 16

Which of the following results would be observed after one generation if DNA replication were conservative?
Equal amounts of heavy and light DNA
DNA of intermediate intensity
Just heavy DNA
Just light DNA

Answer 16

Equal amounts of heavy and light DNA

Question 17

which of the following results would be observed after one generation if DNA replication were dispersive?
Equal amounts of heavy and light DNA
DNA of Intermediate intensity
Just heavy DNA
Just light DNA

Answer 17

DNA of intermediate intensity

Question 18

Which of the following results would be observed after two generations if DNA replication were dispersive?
Equal amounts of heavy and light DNA
DNA of intermediate intensity
Just heavy DNA
Just light DNA

Answer 18

DNA of intermediate Intensity

Question 19

How many rounds of DNA replication occurred to get the labeling pattern seen on the right in the previous figure?
0
1
2
3
4

Answer 19

2

Question 20

Which enzyme fills in the gap left by the RNA primer during replication?
Primate
Helical
DNA polymerase
RNA polymerase
DNA ligase

Answer 20

DNA polymerase

Question 21

Where is PCR used?
Eukaryotic cells
Prokaryotic cells
All cells
The laboratory

Answer 21

The laboratory

Question 22

Where do restriction enzymes come from?
Viruses
Protists
Bacteria
Plants

Answer 22

Bacteria

Question 23

Which of the following would not block the process of DNA synthesis by DNA polymerase?
Removal of DNA ligase from the DNA replication process
Removal of the 3’-OH from the nucleotides used by DNA polymerase
Removal of the 5’ triphosphate from the nucleotides used by DNA polymerase
Removal of the base from the nucleotides used by DNA polymerase

Answer 23

Removal of DNA ligase from the DNA replication process

Question 24

How much of the human genome encodes proteins?
3%
24%
53%
71%
97%

Answer 24

All of them

Question 25

Which of the following lacks a genome? Nucleus Chloroplast Mitochondrion Virus All of these have a genome

Answer 25

All of these have a genome

Question 26

Which of the following is/are not encoded in the genome? Proteins RNAs Lipids Carbohydrates

Answer 26

Lipids Carbohydrates

Question 27

How can researchers distinguish exons from introns in DNA? Only exons code for amino acids Primers won’t bind to introns Exons have a characteristic sequence The sequence of exons complements the mRNA sequence

Answer 27

The sequence of exons complements the mRNA sequence

Question 28

A missense mutation may Disable protein function Alter protein function Have no effect on protein function

Answer 28

All of the above

Question 29

An insertion of the three nucleotides into the exon of a gene would change the reading from of the mRNA True False

Answer 29

False

Question 30

Which of the following mutations has the potential to shorten a protein? Silent Missense Nonsense Frame shift

Answer 30

Nonsense Frame shift

Question 31

Which mutations in a somatic cell are inherited by the progeny of an organism? Point mutations Silent mutations Deletions All of the above None of the above

Answer 31

None of the above

Question 32

Which enzyme would be used to repair a break in the DNA backbone? DNA polymerase DNA ligase Helical Endonuclease All of the above

Answer 32

DNA ligase

Question 33

Which of the following is considered a mutagen? Cigarette smoke Sunlight X-rays All of the above

Answer 33

All of the above

Question 34

PCR steps in order Extension Denaturation Repeat Annealing

Answer 34

Denaturation, annealing, extension, repeat

Question 35

DNA fingerprinting: Requires DNA samples from the fingertips of individual tested Examines the sizes of VNTRs Requires large amounts of DNA Determines which genes are turned on All of the above

Answer 35

Examines the sizes of VNTRs

Question 36

What kind of genetic variation involves whole genes? Single nucleotide polymorphisms Point mutations Copy number variation Variable number of tandem repeats

Answer 36

Copy number variation

Question 37

A tripod plant has One extra chromosome One extra set of chromosomes Three chromosomes Nine chromosomes

Answer 37

One extra set of chromosomes