Sample exam2Replication starts near x.
One strand of the DNA has been labeled with heavy (15) N, hence the capital letters, but all newly synthesized DNA in the daughter cells will have normal N (lower case
Draw these chromosome sequences as they would look in the two daughter and four granddaughter cells, keeping track of the heavy and light DNA sequences.
(This diagram represents regions around a gene encoding a mRNA.Exon I of the mRNA contains the translation initiation AUG codon.Exon IV contains the UGA termination codon.
The letters A through E above the diagram refer to areas of the gene and its transcript located directly below them.
a.What region of the primar look like in the wild type and in the mutant?
6) A geneticist isolates a gene that contains five exons.She then isolates the mature mRNA produced by this gene.
g c a
Amino acnd filled in with DNA, the fragments must then be joined.Which enzyme removes t.
12 cDNA and its Functions Part A.Multiple Choice 1.Nucleic acids are composed of chains of
D.pyrimidines.2.The fact that a DNA strand contains equal amounts of the bases A and T allows one to realize that
these molecules bond together.
B.DNA is a double stranded helix.
C.these molecules are not the same size.
one is a purine and one is a pyrimidine.3.In the spiraling helix of a DNA molecule, each cross-member (or step) consists of two
DNA molecules from the cells of a tomato and those of a potato differ in their
type of sugar.
B.sequence of bases.
C.number of strands.
order of phosphates.5.DNA is considered to be the master molecule in cells because it
A.is a double helix.
B.is located in the nucleus.
C.ultimately controls all cell activity.
D.stores energy as high energy bonds.6.Replication MOST accurately refers to the synthesis of
complementary strands of RNA for mitosis.
B.complementary strands of DNA for mitosis.
C.proteins based on the sequence of bases in RNA.D.proteins based on the sequence of bases in DNA.7.The two molecules resulting from the replication of DNA
differ in terms of function only.
B.differ because one is old and one is new.
C.are the same in every regard unless a mutation has occurred.
D.differ because one contains ribose and one contains deoxyribose.8.
Which of the following is mass-produced directly by cells altered by recombinant DNA techniques?
Which of the following is NOT a result of recombinant DNA?
A.Changing a persons genetics.
B.Developing hybrid species of food crops.
C.Mass-producing molecules for medical treatments.
Producing laboratory clones of organisms for scientific investigations.
10.A polymer of nucleic acids was identified in the cytoplasm of a living animal cell.
Which of the following is MOST likely true about this molecule?
.Contains thymine.11.Which of the following is true for any given strand of DNA? A.
[A] = [C], [T] = [G] B.[A] = [G], [T] = [C] C.[A] + [T] = [G] + [C] D.[A] + [G] = [T] + [C] 12.If a species contains 23% A in its DNA, what is the percentage of guanine it would contain? A.23% B.46% C.54% D.27% 13.Which of the following statements about DNA replication is NOT correct? A.The enzyme that catalyzes replication is DNA polymerase.
Unzipping of the DNA molecule occurs as hydrogen bonds break.C.Replication occurs as each base is paired with another exactly like it.D.
The process is known as semi-conservative because one old strand is conserved in the new molecule.14.In modern biochemical genetics, the flow of inherited information is from A.protein to RNA to DNA.
B.DNA to RNA to protein.C.DNA to protein to RNA.D.RNA to DNA to protein.15.How many bases (nucleotides) are required to code for a single amino acid? A.
3 C.20 D.64 16.
Transcription of part of a DNA molecule with a nucleotide sequence of AAACAACTT results in a mRNA molecule with the complementary sequence of A.TTTGAAGCC.B.CCCACCTCC.
What are ribosomes composed of? A.rRNA and protein.B.
mRNA, rRNA, and protein.
C.Two subunits each consisting of rRNA only.
Two subunits each consisting of several proteins only.
18.If one strand of DNA has the base sequence AAGCTT, which of the following is the correct base sequence of the complementary strand? A.
TTCGUU.19.During the process of transcription, the information in A.
RNA is converted into DNA information.B.DNA is converted into RNA information.
C.protein is converted into RNA information.D.RNA is converted into protein information.
20.Which of the following is NOT true about the Genetic Code? A.It contains start and stop codons.B.It is different in different types of cells.
It has 64 different possibilities of base sequences.D.It is composed of a triplet code of three bases per codon.21.
Initiation, elongation, and termination are three stages in A.DNA replication.B.polypeptide synthesis C.
development of cancer D.codon-anticodon formation 22.What signals the end of the process of translation? A.A terminator codon occurs.B.The cell runs out of amino acids.C.The ribosomes run off the end of mRNA.D.Enzymes determine that the polypeptide is long enough.23.Which of the following BEST describes protein synthesis?
Transcription in the nucleus followed by translation at the ribosomes.
B.Translation in the nucleus followed by transcription at the ribosomes.
C.Transcription in the nucleus followed by translation at endoplasmic reticulum.
D.Translation in the nucleus followed by transcription at endoplasmic reticulum.
24.All of the following are true about mRNA EXCEPT ONE.
It is made at the ribosomes.
B.It contains uracil in place of thymine.
It is synthesized from a DNA template.
It can be found in the cytoplasm of cells.25.During transcription,
A.deoxyribose turns into ribose.B.
uracil matches up with adenine.C.
uracil matches up with thymine.
D.deoxyribose is used in place of ribose.26.Which of the following sequences BEST outlines the process of pro