Mac 7: End

Question 1

In a sample of double-stranded DNA, 20% percent of the nitrogenous base are guanine (G). What percentage of the nitrogenous bases in the sample are cytosine (C)?

• 40%
• 20%
• 80%
• 10%

Answer 1

-20%

Question 2

In a sample of double-stranded DNA, 40% percent of the nitrogenous bases are adenine (A). What percentage of the nitrogenous bases in the sample are Thymine (T)?

• 40%
• 20%
• 80%
• 10%

Answer 2

-40%

Question 3

Which of the following does NOT participate in DNA replication?

• DNA polymerase
• Ligase
• Uricase
• Helicase

Answer 3

-Uricase

Question 4

Which among the following are parts of an mRNA molecule that are removed before the synthesis?

• Genomes
• Introns
• Promoters
• Exons

Answer 4

-Introns

Question 5

Which of the following are true during DNA replication?

• DNA polymerase unwinds DNA at replication forks
• DNA polymerase proofreads DNA at replication forks
• Helicase breaks the hydrogen bonds between complementary DNa strands
• Ligase breaks the hydrogen bonds between complementary DNA strands

Answer 5

-DNA polymerase proofreads DNA, correcting errors

Question 6

Which of the following is found on a DNA nucleotide?

• All of the above
• Three DNA bases
• One deoxyribose sugar, one nitrogenous base and one phosphate group
• mRNA, tRNA, rRNA

Answer 6

-One deoxyribose sugar, one nitrogenous base and one phosphate group

Question 7

Given the following DNA sequence AATGCGTGCACTCAG, what would be the complementary generated after the replication?

• TTACGCACGTGAGTA
• AATGGGCCAGCGUUA
• TTAGCGAGCTGAGATC
• TTACGCACGTGAGTC

Answer 7

-TTACGCACGTGAGTC

Question 8

Given the mRNA sequence AUGUUAAUGUGCUGCUGCTTACGCACGTGAGTC. How many amino acids will be produced in this sequence?

• 11
• 14
• 13
• 10

Answer 8

-11

Question 9

Given the following DNA sequence AATGGTGCACTCAGAUGUGA which among the following stops the translation of the sequence?

• UCA
• UUA
• AUG
• UGA

Answer 9

-UGA

Question 10

Which of the following types of RNA transports specific amino acids to the ribosomes for protein synthesis?

• tRNA
• rRNA
• mRNA
• gRNA

Answer 10

-tRNA

Question 11

What is the role of DNA ligase during replication?

• Breaks the hydrogen bonds between complementary DNA strands
• Unwinds DNA at replication forks
• Joins Okazaki Fragments
• All of the above

Answer 11

-Joins Okazaki fragments

Question 12

It is the unique component needed in the Sanger sequencing reaction?

• RNA primase
• DNA polymerase
• Dideoxy nucleotides
• Helicase

Answer 12

-Dideoxy nucleotides

Question 13

It is the process of determining the sequence of nucleotide bases (As, Ts, Cs and Gs)?

• DNA sequencing
• DNA cloning
• Genetic Therapy
• Genetic Reprogramming

Answer 13

-DNA sequencing

Question 14

Which statement/s are true or false

rRNA associates with proteins to form ribosomes, which structurally support & catalyze protein synthesis.

tRNA encodes amino acid sequences.

Answer 14

-First statement is TRUE; Second statement is FALSE

Question 15

Which statement/s are true or false

The codon AUG signals “stop”.

Codons UGA, UAA, and UAG signify “start”.

Answer 15

-Both statements are FALSE

Question 16

Which statement/s are true or false

DNA stores RNA & protein-encoding information, & transfers information to daughter cells.

RNA carries protein-encoding information & helps to make proteins

Answer 16

-Both statements are TRUE

Question 17

Using the codon charts, what is the sequence of amino acids that is produced when this RNA is translated?

ACU GUU CGU
(WITH IMAGE TO)

• Thr Val Arg
• Gly Thr Arg
• Thr Arg Gly
• Thr Val Gly

Answer 17

-Thr Val Arg

Question 18

Which statement/s are true or false

Different codons that specify the same amino acid are termed
synonymous codons.

Nonsynonymous codons encode different amino acids.

Answer 18

-Both statements are TRUE