RNA & Recombinant DNA

1.

1 point

1) Nucleic acids are composed of chains of

genes

purines

nucleotides

pyrimidines

2.

1 point

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

DNA is a double stranded helix

these molecules are not the same size

one is a purine and one is a pyrimidine

3.

1 point

3) In the spiraling helix of a DNA molecule, each cross-member (or step) consists of two

sugars

purines

phosphates

nitrogenous bases

4.

1 point

4) DNA molecules from the cells of a tomato and those of a potato differ in their

type of sugar

sequence of bases

number of strands

order of phosphates

5.

1 point

5) DNA is considered to be the master molecule in cells because it...

is a double helix

is located in the nucleus

ultimately controls all cell activity

stores energy as high energy bonds

6.

1 point

6) Replication MOST accurately refers to the synthesis of

proteins based on the sequence of bases in DNA

complementary strands of DNA for mitosis

complementary strands of RNA for mitosis

proteins based on the sequence of bases in RNA

7.

1 point

7) The two molecules resulting from the replication of DNA?

differ in terms of function only

differ because one is old and one is new

are the same in every regard unless a mutation has occurred

differ because one contains ribose and one contains deoxyribose

8.

1 point

8) Which of the following is mass-produced directly by cells altered by recombinant DNA techniques?

Insulin

Glycogen

Cholesterol

Testosterone

9.

1 point

9) Which of the following is NOT a result of recombinant DNA?

Mass-producing molecules for medical treatments

Producing laboratory clones of organisms for scientific investigations

Developing hybrid species of food crops

Changing a person’s genetics

10.

1 point

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

Contains ribose

Double stranded

Helical

11.

1 point

11) Which of the following true for any given strand of DNA?

[A] + [T] = [G] + [C]

[A] + [G] = [T] + [C]

[A] = [C], [T] = [G]

[A] = [G], [T] = [C]

12.

1 point

12) If a species contains 23% A in its DNA, what is the percentage of guanine it would contain?

46%

27%

23%

54%

13.

1 point

13) Which of the following segments about DNA replication is NOT correct?

The enzyme that catalyzes replication is DNA polymerase

Replication occurs as each base is paired with another exactly like it

Unzipping of the DNA molecule occurs as hydrogen bonds break

The process is known as semi-conservative because one old strand is conserved in the new molecule.

14.

1 point

14) In modern biochemical genetics, the flow of inherited information is from

DNA to RNA to protein

RNA to DNA to protein

protein to RNA to DNA

DNA to protein to RNA

15.

1 point

15) How many bases (nucleotides) are required to code for a single amino acid?

1

20

3

64

16.

1 point

16) Transcription of part of a DNA molecule with a nucleotide sequence of AAACAACTT results in a mRNA molecule with the complementary sequence of

UUUGUUGAA

GGGAGAACC

TTTGAAGCC

CCCACCTCC

17.

1 point

17) Suppose the following DNA sequence was mutated from AGAGAGAGAGAGAGAGAG to AGAAGAGAGATCGAGAG. What amino acid sequence will be generated based on this mutated DNA?

glu-arg-glu-leu-leu-leu

ser-leu-ser-leu-ser-leu

leu-phe-arg-glu-glu-glu

ser-ser-leu

18.

1 point

18) What amino acid sequence will be generated based on the following mRNA codon sequence? AUG-UCU-UCG-UUA-UCC-UUG

met-ser-ser-leu-ser-leu

met-arg-glu-arg-glu-arg

met-ser-leu-ser-leu-ser

met-glu-arg-arg-gln-leu

19.

1 point

The sequence of nucleotides in DNA that codes for the polypeptide sequence Phe-Leu-Ile-Val is

AAA-GAA-TAA-CAA

AUG-CTG-CAG-TAT

AAA-AAT-ATA-ACA

TTG-CTA-CAG-TAG

20.

1 point

20) The amino acids phenylalanine, alanine, and lysine exist in a sequence in a particular protein. Which of the following DNA sequences would cause proline to substitute for alanine?

AAA-GGG-TTT

AAA-CCG-TTT

AAA-CCC-TTT

AAA-CGG-TTA

21.

1 point

21) What amino acid strand is formed from this DNA strand? A – T – A – C – G – A – C – A – A – G – C – C

Tyrosine – alanine – valine – arginine

Methionine – alanine – leucine – alanine

Tyrosine – arginine – leucine – alanine

Methionine – arginine – glutamic acid – cysteine

22.

1 point

22. Some geneticists consider the third base of a codon to be less important than the first two bases as a code for a specific amino acid. Which of the following statements DOES NOT SUPPORT this idea?

There are three codons, any one of which will position an isoleucine

Even though the A is replaced by a C, the triplet AGG will still position an arginine

Any of the bases following a CC_ sequence will position a proline into the protein

Even though a G replaces the last A, the triplet UAA will still terminate a polypeptide

23.

1 point

23) A single substitution in the third position of a triplet would have the greatest probability of a mutational effect on the codon

CGU

GUU

AUU

AUG

24.

1 point

34) Which of the following mutations is NOT a result of addition or deletion of the nucleotide sequence CATUAUCCC?

ATUAUCCC

CATTUAUCCC

CATUAUCGC

CTUAUCCC

25.

1 point

25) Incorrect base pairing MOST likely only causes a serious problem for the organism if it happens during

transcription forming mRNA

replication of DNA

translation when tRNA brings in amino acids

translation if rRNA misaligns mRNA

26.

1 point

The following events occur during translation, but not necessarily in the sequence below. What is the correct sequence??
1. Peptide bonds form.
2. Anticodons match codons.
3. tRNA molecules are freed into the cytoplasm.

3, 1, 2

3, 2, 1

2, 3, 1

2, 1, 3

27.

1 point

27) The anticodon differs from the codon in that the anticodon

stands for a particular amino acid, but the codon codes for nucleotide bases

contains thymine, but the codon contains uracil

attaches to the ribosome, but the codon attaches to amino acids

is a component of tRNA, where the codon is a component of mRNA

28.

1 point

28) Which of the following sequences BEST outlines the process of protein synthesis?

DNA, tRNA, amino acids, mRNA

DNA, amino acids, mRNA, tRNA

mRNA, DNA, tRNA, amino acids

DNA, mRNA, tRNA, amino acids

29.

2 points

29) Only animals have DNA in their cells.

True

False

30.

2 points

30) All living things on earth share certain identical sequences of bases on their genome.

True

False

31.

2 points

31) The "backbone" or outer strands of DNA are repeating sugars and bases.

True

False

32.

2 points

32) With one nucleotide, the nitrogen base is attached to the phosphate group.

True

False

33.

2 points

33) mRNA is translated into a sequence of anime acids.

True

False

34.

2 points

34) Ribosomal RNA is where protein synthesis occurs.

True

False

35.

2 points

Anti-codons and Codons are the same.

True

False

36.

2 points

Helicase is the only enzyme involved in unzipping.

True

False

37.

2 points

DNA and RNA polymerase are the same.

True

False

38.

2 points

38) The sequence of tRNA codons specifies a sequence of amino acids.

True

False

39.

2 points

39) AUG is the only start codon we have learned.

True

False

40.

2 points

Transcriptions the copying of mRNA from DNA.

True

False