Unit 3 Cell Bio Stiller

Question 1

Which of the following is the correct nucleotide base pairing for DNA?

Answer 1

AT

Question 2

Nucleotides contain

Answer 2

a sugar, a phosphate, and a nitrogen-containing base.

Question 3

Which of the following are purine nucleotides?

Answer 3

adenine and guanine

Question 4

DNA replication is said to be:

Answer 4

semiconservative

Question 5

DNA is wrapped around ______________ to form _________________

Answer 5

histones, chromatin

Question 6

The structure of chromatin resembles ______________________.

Answer 6

beads on a string

Question 7

The enzyme that unwinds DNA for replication

Answer 7

helicase

Question 8

Enzyme involved in DNA replication

Answer 8

all the above

polymerase, ligase, helicase, topoisomerase

Question 9

Replication of DNA begins at which site?

Answer 9

origin

Question 10

Continuous DNA replication:

Answer 10

leading strand

Question 11

Discontinuous DNA replication:

Answer 11

B and C

lagging strand and okazaki fragment

Question 12

(Mitotic) chromosomes consist of ______________ that are liked at the ________________.

Answer 12

sister chromatids; centromere

Question 13

The enzyme that synthesizes the RNA primer

Answer 13

primase

Question 14

The enzyme that links Okazaki fragments

Answer 14

ligase

Question 15

The enzyme that proof reads DNA

Answer 15

polymerase

Question 16

True or false? In DNA replication, new nucleotides are delivered as nucleoside-triphosphates

Answer 16

TRUE

Question 17

DNA polymerase adds new nucleotides to the

Answer 17

3’ end of the newly forming strand

Question 18

DNA polymerase binds to

Answer 18

primer

Question 19

The approximate error rate of DNA replication with proofreading is

Answer 19

1 mistake per 10,000,000 nucleotides (107)

Question 20

In transcription….

Answer 20

DNA template is used to synthesize mRNA.

Question 21

RNA polymerase binds to

Answer 21

promoter

Question 22

_________________ blocks RNA polymerase and decreases transcription

Answer 22

repressor

Question 23

If you were looking for a TATA-box your best bet would be to ….

Answer 23

to take a close look at the template strand of DNA in eukaryotes.

Question 24

Post-transcriptional RNA modification involves….

Answer 24

all the above

addition of 5 prime G-cap, addition of 3 prime poly-A-tail, removal of introns, RNA splicing

Question 25

True or false. The peptidyl-amino transferase activity of ribosomes is located within the small subunit.

Answer 25

FALSE

Question 26

In translation,...

Answer 26

mRNA template is used to synthesize protein

Question 27

The anticodon sequence is located on

Answer 27

tRNA

Question 28

Which of the following is not directly involved in translation?

Answer 28

DNA

Question 29

Translation initiation involves

Answer 29

binding rRNA to mRNA

Question 30

Translation elongation involves

Answer 30

transfer of amino acid from P site to A site | should be a to p

Question 31

Translation termination involves

Answer 31

rRNA reaching stop codon

Question 32

A piece of mRNA that is 600 nucleotides long would be able to encode at most

Answer 32

200 AA

Question 33

The first codon used to begin making protein is always

Answer 33

AUG

Question 34

Which of the following is a stop codon?

Answer 34

All the above | UGA, UAA, UAG

Question 35

In elongation of translation, charged tRNA is brought into which site?

Answer 35

A site

Question 36

the enzyme involved in charging tRNA with an amino acid is ______________

Answer 36

aminoacyl-tRNA synthetase

Question 37

The enzyme involved in adding charged tRNA to the growing polypeptide is ____________

Answer 37

peptidyl-aminotransferase

Question 38

The Trp-operon is ...

Answer 38

repressible

Question 39

The Lac-operon is ...

Answer 39

inducible

Question 40

Eukaryotic gene expression involves ...

Answer 40

all the above | activiators, enhancers, mediators, regulators

Question 41

(extra) Phospholipids are

Answer 41

Amphipathic

Question 42

(extra) The most common phospholipids on the extracellular side of plasma membrane is/are

Answer 42

Phosphatidylcholine

Question 43

(extra) The most common phospholipids on the cytosolic side of plasma membrane is/ are

Answer 43

Phosohatidylethanolamine and phosphatidylserine

Question 44

(extra) Which of the following is not a type of membrane protein?

Answer 44

Transporters, anchors, and receptors and enzymes

Question 45

(extra) True or false: channels transmembrane proteins

Answer 45

TRUE

Question 46

(extra) True or false: transmembrane proteins are integral proteins

Answer 46

TRUE