Exam 2 (Part 2)

Question 1

Chargaff’s rule states

Answer 1

A=T, G=C

Question 2

T/F: A cell has twice as much DNA in the G2 phase as it has in the G1 phase

Answer 2

True

Question 3

If one trait is always expressed over the other, the hidden trait is said to be

Answer 3

recessive

Question 4

An important tumor-suppressing gene

Answer 4

p53

Question 5

Prior to DNA being identified as the genetic material, which macromolecule was considered to be the most likely canidate by most scienists

Answer 5

protein

Question 6

Where do microtubules of the spindle apparatus originate from during mitosis in both plant and animal cells

Answer 6

centrosome

Question 7

In a diploid organism the cells produced by mitosis would be

Answer 7

diploid

Question 8

What is true for PCR

Answer 8

stands for polymerase chain reaction, accomplished using heat-stable DNA polymerase, method for rapid amplification of DNA

Question 9

Linked genes tend to be inherited both together from the mother or from the father because

Answer 9

linked genes are located close together on the same chromosome

Question 10

T/F: Characters that are due to polygenic inheritance often exhibit a wide variety (continuous distributuion) of possible traits/values

Answer 10

True

Question 11

The genetic makeup of an organism

Answer 11

genotype

Question 12

T/F: An operon consists of a control element, a promoter, a gene, and an enhancer

Answer 12

False

Question 13

Which of the following DNa sequences is most likely to be a restriction site

Answer 13

GGCC CCGG

Question 14

Crossover between non-sister chromatids during meiosis form

Answer 14

chiasma

Question 15

DNA is wrapped around

Answer 15

histones

Question 16

Occurs in meiosis but not in mitosis

Answer 16

synapsis of chromosomes

Question 17

Not a level where control of gene expression occurs in eukaryotes

Answer 17

initiation of replication

Question 18

Which of the following is not an example of epigenetic phenomena?
Genetic imprinting
Histone acetylation
DNA mutation
DNA mehylation
Gene  Silencing

Answer 18

DNA mutation

Question 19

During which phase of the cell cycle are he chromosomes replicaed

Answer 19

S

Question 20

Crossing over occurs in which phase of Meiosis

Answer 20

Prophase I

Question 21

A cell will become committed to mitosis once it passes what checkpoint

Answer 21

G2

Question 22

What is the correct number of autosomal chromosomes for a human gamee

Answer 22

22

Question 23

In prokaryotes, Which enzyme catalyzes the elongation of a DNA strand in the 5’ -> 3’ direction

Answer 23

DNA polymerase III

Question 24

In prokaryotes, Which enzyme removes RNA nucleotides from the primer sequence and adds equivalent DNA nucleoides to he 3’ end of Okazaki fragments

Answer 24

DNA polymerase I

Question 25

Separation of the two DNA strands during replication is carried out by which enzyme

Answer 25

Helicase

Question 26

Which enzyme covalently connects segments of DNA

Answer 26

DNA ligase

Question 27

The tryptophan operon might be turned off if

Answer 27

cellular levels of tryptophan tRNA are high and tryptophan tRNA is present in he growth media

Question 28

Meiosis produces ____ cells with a ploidy number of ____ n

Answer 28

4, 1

Question 29

Which mutation would most likely to have a harmful effect on an organism

Answer 29

A single nucleotide inserion downstream of, and close to, the start of a coding sequence

Question 30

The functioning of enhancers is an example of

Answer 30

transcriptional control of gene expression

Question 31

An example of post-transcriptional control of gene expression

Answer 31

the removal of introns and alternative splicing of exons

Question 32

Small RNAs can interfere with gene expression through

Answer 32

gene silencing

Question 33

Cyclin activates what key protein involved in controlling parts of the cell cycle

Answer 33

cyclin-dependent kinase

Question 34

What is not rue about cytokinesis in a plant cell

Answer 34

a constricting set of actin filaments creates a cleavage furrow

Question 35

T/F:Proteosomes degrade proeins

Answer 35

True

Question 36

Number of gametes produced after a single germ cell undergoes meiosis

Answer 36

4

Question 37

What is a TATA box

Answer 37

a promoter sequence commonly found in eukaryotes