Bio148 Exam #2 Practice Exams Questions And Correct Verified Answers |Well Graded A+

Bio148 Exam #2 Practice Exams
Questions And Correct Verified Answers
|Well Graded A+
Which of the following is TRUE about translation in eukaryotes?
a. The first amino acid translated from all mRNAs is the same
b. Translation begins at the very 5' end of all mRNAs
c. Translation terminates (stops) after the polyad tail is translated into amino acids
d. Each nucleotide in an mRNA specifies one amino acid
e. There are 20 different codons in mRNA, corresponding to the 20 different amino
acids - CORRECT ANSWERS-A

Which of the following about gene switches is TRUE?
a. They are proteins
b. RNA polymerase binds to them directly
c. They are located within the promoter
d. They regulate the number of times an RNA is translated
e. They can be bound by activator proteins to "turn on" transcription - CORRECT
ANSWERS-E

At what point in the central dogma does addition of the poly(A) tail occur?
a. Between the gene and synthesis of the primary transcript
b. Between synthesis of the primary transcript and formation of the mature mRNA
c. Between formation of the mature mRNA and synthesis of the polypeptide
d. Between synthesis of the polypeptide and formation of the finished protein -
CORRECT ANSWERS-B

Which of the following would you expect to find in a mature mRNA?
a. Introns
b. Promoters
c. Codons
d. Amino acids
e. Switches - CORRECT ANSWERS-C

Refer to the genetic code in this exam regarding the section of mRNA directly below.

5' UCUGAUGGGCUUU...

Beginning with the start codon, which amino acids, in order, are coded for by this
section of mRNA?
a. serine, aspartic acid, glycine, leucine
b. methionine, glycine, phenylalanine

, c. methionine, valine, glycine, phenylalanine
d. threonine, methionine, glycine - CORRECT ANSWERS-B

A peptide has the sequence phe-pro-lys-gly-phe-pro. Which of the following sequences
in the coding strand
of the DNA could code for this peptide?
a. UUU-CCC-AAA-GGG-UUU-CCC
b. AUG-AAA-GGG-TTT-CCC-AAA-GGG
c. TTT-CCC-AAA-GGG-TTT-CCC
d. GGG-AAA-TTT-AAA-CCC-ACT-GGG
e. ACT-TAC-CAT-AAA-CAT-TAC-UGA - CORRECT ANSWERS-C
Many different types of protein molecules are made within cells. Which of the following
could be influenced
by the actions of those protein molecules?
a. Both an organism's physical characteristics and the function of the organism's cells
b. An organism's physical characteristics but not the function of the organism's cells
c. The function of the organism's cells but not the organism's physical characteristics
d. Neither an organism's physical characteristics nor the function of the organism's cells
- CORRECT ANSWERS-A

What happens to the intron sections of genes?
a. They are neither transcribed nor translated
b. They are transcribed and translated
c. They are transcribed but not translated
d. They are not transcribed but they are translated. - CORRECT ANSWERS-C

The DNA molecules in eye cells contain which of the following?
a. Genes that encode eye color and skin color, and switches that control both eye color
and skin color
b. Genes that encode eye color and skin color, and switches that control eye color only
(not skin color)
c. Genes and switches that encode eye color only (not skin color)
d. Genes that control eye and skin color, but not switches for either of these genes. -
CORRECT ANSWERS-A

Which of the following is a part of a DNA molecule?
a. Promoter
b. Switch
c. Gene
d. All of the above
e. A and C only - CORRECT ANSWERS-D

5' caps and 3' poly(A) tails of eukaryotic mRNAs ______.
a. protect mRNA from degradation and enhance transcription
b. mark the beginning and end of introns, respectively
c. act as sites for the start and stop of translation, respectively