Biology chapter questions w4 | Biology homework help

Biology chapter questions w4

Question 1

1.      A component of bacteria that are often used in biotechnology are

 

[removed]

A.

operons.

[removed]

B.

introns.

[removed]

C.

exons.

[removed]

D.

polypeptides.

[removed]

E.

plasmids.

 

5 points   

 

Question 2

1.      In DNA, cytosine bonds to guanine. In RNA, cytosine bonds to

 

[removed]

A.

guanine.

[removed]

B.

uracil.

[removed]

C.

cytosine.

[removed]

D.

thymine.

[removed]

E.

adenine.

 

5 points   

Question 3

1.      We refer to the DNA code as being redundant or repetitive. This means that

 

[removed]

A.

each triplet codes for one amino acid.

[removed]

B.

each triplet codes for a different amino acid.

[removed]

C.

some codons code for the same amino acid.

[removed]

D.

one codon codes for one amino acid.

[removed]

E.

a single triplet may code for more than one amino acid.

 

5 points   

Question 4

1.      A package of histones with DNA wrapped around them forms spherical structures called

 

[removed]

A.

lysosomes.

[removed]

B.

chromatin.

[removed]

C.

nucleosomes.

[removed]

D.

nucleoli.

[removed]

E.

ribosomes.

 

5 points   

Question 5

1.      What form of RNA carries instructions from the nucleus to the ribosome?

 

[removed]

A.

rRNA

[removed]

B.

mRNA

[removed]

C.

sRNA

[removed]

D.

bRNA

[removed]

E.

tRNA

 

5 points   

Question 6

1.      The fact that the two strands composing a DNA molecule are called antiparallel has to do with the orientation of the

 

[removed]

A.

sulfide bonds.

[removed]

B.

bases.

[removed]

C.

sugar molecules.

[removed]

D.

hydrogen bonds.

[removed]

E.

phosphate molecules.

 

5 points   

Question 7

1.      The bases are bonded to what part of the backbone of the DNA molecule?

 

[removed]

A.

the 4’ carbon atom of the sugar molecule.

[removed]

B.

the 2’ carbon atom of the sugar molecule.

[removed]

C.

the 1’ carbon atom of the sugar molecule.

[removed]

D.

the 5’ carbon atom of the sugar molecule.

[removed]

E.

the 3’ carbon atom of the sugar molecule.

 

5 points   

Question 8

1.      The most important experimental results that suggested to Watson and Crick that DNA was in the form of a helix was

 

[removed]

A.

X-ray data from Rosalind Franklin.

[removed]

B.

the findings of Chargaff that DNA always had equal amounts of A and T and equal amounts of G and C.

[removed]

C.

the discovery that DNA is wound around histone proteins.

[removed]

D.

Griffith’s results with transformation.

[removed]

E.

understanding DNA replication.

 

5 points   

Question 9

1.      What enzyme is used to “glue” together the ends of cut pieces of DNA?

 

[removed]

A.

RNA polymerase

[removed]

B.

protease

[removed]

C.

restriction enzymes

[removed]

D.

DNA ligase

[removed]

E.

DNA polymerase

 

5 points   

Question 10

1.      DNA replication of a single DNA molecule is referred to as semiconservative because

 

[removed]

A.

one DNA strand is replicated continuously, while the other must be replicated discontinuously.

[removed]

B.

it results in two nonidentical DNA molecules.

[removed]

C.

each of the two DNA molecules will consist of one parental strand and one newly synthesized strand.

[removed]

D.

all the DNA strands in the two DNA molecules will have both parental and newly synthesized DNA.

[removed]

E.

of the two DNA molecules, one is made up totally of parental DNA, while the other is entirely newly synthesized DNA.

 

5 points   

Question 11

1.      The two subunits of the ribosome join during

 

[removed]

A.

termination of transcription.

[removed]

B.

termination of translation.

[removed]

C.

promotion of transcription.

[removed]

D.

elongation.

[removed]

E.

initiation of translation.

 

5 points   

Question 12

1.      In eukaryotes, transcription occurs in the

 

[removed]

A.

mitochondria.

[removed]

B.

cytoplasm.

[removed]

C.

ribosome.

[removed]

D.

nucleus.

[removed]

E.

cell membrane.

 

5 points   

Question 13

1.      Base pairing

 

[removed]

A.

occurs between A and C.

[removed]

B.

requires hydrogen bonds.

[removed]

C.

explains the X-ray results from Rosalind Franklin.

[removed]

D.

occurs between identical bases.

[removed]

E.

takes place between sugars and phosphates on the two strands in a helix.

 

5 points   

Question 14

1.      When looking at a table depicting the genetic code, the base sequences signify

 

[removed]

A.

mtDNA.

[removed]

B.

mRNA.

[removed]

C.

rRNA.

[removed]

D.

DNA.

[removed]

E.

tRNA.

 

5 points   

Question 15

1.      DNA replication

 

[removed]

A.

takes place in the nucleus of the cell.

[removed]

B.

does not require proteins.

[removed]

C.

occurs in G1 of interphase.

[removed]

D.

is constantly happening in a cell.

[removed]

E.

occurs in the cytoplasm of the cell.

 

5 points   

Question 16

1.      Hershey and Chase performed an experiment in which they used radioactive isotopes to phosphorus and sulfur to label different components of bacterial viruses. Their results clearly showed that

 

[removed]

A.

the viruses did not contain protein.

[removed]

B.

genetic material normally contains radioactive isotopes.

[removed]

C.

DNA was entering into the infected bacteria.

[removed]

D.

the viruses did not contain DNA.

[removed]

E.

protein was entering into the infected bacteria.

 

5 points   

Question 17

1.      What step in DNA replication precedes the pairing of complementary bases?

 

[removed]

A.

joining of the two strands.

[removed]

B.

polymerization of DNA.

[removed]

C.

mitotic division.

[removed]

D.

formation of the histone core.

[removed]

E.

separation of the two strands.

 

5 points   

Question 18

1.      Normal human body cells contain how many chromosomes?

 

[removed]

A.

44

[removed]

B.

23

[removed]

C.

42

[removed]

D.

22

[removed]

E.

46

 

5 points   

Question 19

1.      In recombinant DNA technology, enzymes used to precisely cut DNA are called

 

[removed]

A.

DNA ligases.

[removed]

B.

RNA polymerases.

[removed]

C.

restriction enzymes.

[removed]

D.

DNA polymerases.

[removed]

E.

vectors.

 

5 points   

Question 20

1.      The anticodon of the tRNA molecule base pairs with

 

[removed]

A.

polypeptides.

[removed]

B.

mRNA.

[removed]

C.

rRNA.

[removed]

D.

amino acids.

[removed]

E.

DNA.