Quiz 7 Flashcards
1
Q
- Initiation of protein synthesis is specified by
Select one:
a. a ribosome binding to smooth endoplasmic reticulum
b. a condensation reaction
c. a stop codon
d. an AUG codon
e. adding amino acids to a growing polypeptide chain
Feedback
A
d. an AUG codon Correct
2
Q
2. The genes in DNA can be transcribed into Select one: a. mRNA, rRNA and protein b. mRNA and protein c. tRNA, rRNA and mRNA d. RNA polymerase and mRNA Incorrect e. introns and exons
A
c. tRNA, rRNA and mRNA
3
Q
- The reason the genetic code is called redundant is because:
Select one:
a. some codons are stop signals
b. all organisms have the same genetic code
c. some amino acids are specified by more than one codon
d. some codons specify more than one amino acid
e. the code is read one codon at a time
A
c. some amino acids are specified by more than one codon
4
Q
4. What structures are responsible for moving along mRNAs and translating them? Select one: a. tRNAs b. endoplasmic reticulum c. ribosomes d. polymerases e. transcriptases
A
c. ribosomes
5
Q
5. What molecules are responsible for supplying amino acids to ribosomes during translation? Select one: a. polymerases Incorrect b. transcriptases c. tRNAs d. ribosomes e. endoplasmic reticulum
A
c. tRNAs supply amino acids to ribosomes during trasnslation
6
Q
6. Which of the following is a feature of RNA and not DNA? Select one: a. contains thymidine b. is double stranded c. contains ribose d. contains uric acid e. contains phosphate
A
c. contains ribose
7
Q
- Ribosomal RNA and transfer RNA have similarities to enzymes in that they
Select one:
a. are produced by translation
b. are produced by transcription
c. have complex three dimensional structures
d. all participate in the ribosomal complex
e. are information bearing molecules
A
c. the similariy between ribosmoal RNA AND tRNA and amino acids is that they all have complex three dimensional structures Correct
8
Q
- What is one advantage of protein synthesis occurring on endoplasmic reticulum?
Select one:
a. it orients the direction of protein synthesis
b. it splices mRNAs into their active form
c. it allows packaging of polypeptides into transport vesicles
d. it provides a membrane for ribosomes to bind onto Incorrect
e. it restricts protein synthesis to a single cellular location
A
c. it allows packaging of polypeptides into transport vesicles
9
Q
- Assuming that these mRNA sequences are in the correct reading frame, which of them could code for two different amino acids?
Select one:
a. GAGAGAGAGAGAGAG
b. AGACGAAGACGAAGA
c. CCTCCACCTCCACCT
d. CCCCCCCCCCCCCCC
e. GGAGGCGGGGGUGGA
A
a. GAGAGAGAGAGAGAG
10
Q
10. You break down a molecule of DNA into its component nucleotides, and find that 20 percent of the nucleotides are adenosines (A). What percentage will be guanosines (G)? Select one: a. 50 b. 60 c. 20 d. 40 Incorrect e. 30
A
e. 30
11
Q
11. A structure consisting of multiple ribosomes bound to a single mRNA molecule is called a Select one: a. centrosome b. nucleosome c. transcriptosome d. desmosome e. polyribosome
A
e. polyribosome
12
Q
12. Which of these mRNA sequences could contain the start of a protein coding sequence? Select one: a. GUAGGCTTATAGC b. UGCCUACACAGAU c. AGCCUACGCUAUA d. CCAUGCCGCAUCC e. AGCCTATGCTATA
A
d. CCAUGCCGCAUCC Correct
13
Q
- Assuming that these mRNA sequences are in the correct reading frame, which of them codes for a homopolymer consisting of one amino acid?
Select one:
a. UGGUGAUGGUGAUGG
b. CUUUUAUUGCUGCUA
c. AUUAUCAUGAUAAUC
d. GAGAGAGAGAGAGAG
e. CCGGCCGGCCGGCCGG
A
b. CUUUUAUUGCUGCUA
14
Q
- How many amino acids would be found in the translation product resulting from a DNA coding region of 450 nucleotides?
Select one:
a. 450
b. 1350
c. 150
d. 447
e. it is not possible to determine with the information given
A
c. 150
15
Q
15. If one strand of a DNA molecule is TCGGATGCGATAT, the other strand must be: Select one: a. CATTGCATCGCGG b. AUAUCGCAUCGGA c. AGCCTACGCTATA d. TATAGCGTAGGCT e. ATATCGCATCGGA
A
c. AGCCTACGCTATA
