Misc question Flashcards
1
Q
The process by which the base sequence of an RNA molecule is used to direct the synthesis of a protein is called \_\_\_\_\_\_\_\_. A) replication B) transcription C) reverse transcription D) translation
A
d) translation
2
Q
During translation elongation, which event happens last?
A) A tRNA carrying an amino acid binds to the A site.
B) A peptide bond forms.
C) A tRNA molecule translocates from the A site to the P site.
D) A tRNA molecule translocates from the P site to the E site.
A
D) A tRNA molecule translocates from the P site to the E site.
3
Q
Which is true regarding translation in bacteria?
A) Translation begins with formation of the 30S initiation complex.
B) Translation ends when the Shine-Dalgarno sequence is reached.
C) The 70S ribosome is composed of a 20S and 50S subunit.
D) All of the choices are correct.
A
A) Translation begins with formation of the 30S initiation complex.
4
Q
In \_\_\_\_\_\_\_\_, ribosomes can attach to the mRNA and begin translation even though transcription has not been completed. A) bacteria B) eukaryotes C) fungi D) protozoa and some plants
A
a) bacteria
5
Q
\_\_\_\_\_\_\_\_ molecules deliver amino acids to ribosomes during translation. A) Messenger RNA (mRNA) B) Transfer RNA (tRNA) C) Ribosomal RNA (rRNA) D) Heterogeneous nuclear RNA (hnRNA)
A
tRNA
6
Q
How many different termination codons are used in translation? A) One B) Two C) Three D) Four
A
c) three
7
Q
How many RNA codons encode 60 amino acids? A) 60 B) 180 C) 20 D) 30
A
60
8
Q
Which set of codons terminate transcription in most organisms? A) UGA, UAG, UAA B) AGU, UAG, UAA C) ACT, TAC, ATT D) TGA, TAG, TAA
A
A) UGA, UAG, UAA
9
Q
The portion of the tRNA molecule that binds to the codon on the mRNA is called the \_\_\_\_\_\_\_\_. A) c-codon B) anticodon C) complementary codon D) paracodon
A
anticodon
10
Q
Which of the following is the initiator codon? A) AUG B) UAA C) UAG D) UGA
A
AUG
11
Q
Which of the following is not a termination codon? A) AUG B) UAA C) UAG D) UGA
A
AUG
initiator codon
12
Q
The genetic code is translated in groups of \_\_\_\_\_\_\_\_ bases. A) two B) three C) four D) five
A
three
13
Q
The stop codons are translated codons; that is, they specify amino acids to be inserted into the last position of a growing polypeptide chain.
A
false
14
Q
During transcription elongation, how many pyrophosphate molecules are produced from the incorporation of 20 ribonucleoside monophosphates? A) 20 B) 40 C) 60 D) 5
A
20
15
Q
Order the following regions of a gene from the most upstream region (1) to the most downstream region (5).
- -35 consensus sequence
- Pribnow box
- coding sequence
- rut site
- terminator
A
3, 4, 1, 2, 5
16
Q
The process by which the base sequence of all or a portion of a DNA molecule is used to direct the synthesis of an RNA molecule is called \_\_\_\_\_\_\_\_. A) replication B) transcription C) reverse transcription D) translation
A
transcription
17
Q
The transcribed and translated region of a gene is the \_\_\_\_\_\_\_\_ region. A) leader B) promoter C) coding D) trailer
A
coding
18
Q
Which of the following is in the coding region of a gene? A) Promoter B) Leader C) Trailer D) None of the choices are correct.
A
none
19
Q
The region at which the RNA polymerase binds is the \_\_\_\_\_\_\_\_ region. A) leader B) promoter C) coding D) trailer
A
promoter
20
Q
The coding sequence in the DNA of \_\_\_\_\_\_\_\_ is normally continuous; that is, it is not interrupted by noncoding sequences. A) bacteria B) plants C) mammals D) most insects
A
bacteria
21
Q
The strand of DNA for a particular gene that is copied by the RNA polymerase to form mRNA is called the \_\_\_\_\_\_\_\_ strand. A) leading B) template C) transcription D) copy
A
template
22
Q
While examining the sequence of nucleotides in the replicon region of bacterial DNA, you note an abundance of adenine and thymine base pairs. This leads you to conclude that this particular section of the DNA must be the \_\_\_\_\_\_\_\_. A) oriC site B) Pribnow box C) Shine-Dalgarno sequence D) ter site
A
oric site
23
Q
The Y-shaped part of the DNA molecule where the actual replication process occurs is called the replication \_\_\_\_\_\_\_\_. A) tongue B) fork C) junction D) splice
A
fork
24
Q
Choose the correct order of proteins that function in the initiation, elongation, and termination stages of DNA replication.
A
DnaA, DNA polymerase III, DNA polymerase I, DNA ligase
25
During DNA replication, deoxyribonucleosides are added to the 5' end of Okazaki fragments and to the 3' end of the leading strand.
false
26
```
Which of the following is a region of DNA at the end of a linear chromosome?
A) Telomere
B) Primer
C) Intron
D) Exon
```
telomere
27
```
Which enzyme is a topoisomerase?
A) DNA gyrase
B) DNA ligase
C) DNA polymerase I
D) DNA polymerase III
```
dna gyrase
a top gyrates
28
```
Each chromosome has one or more ________ site(s) where replication begins.
A) promoter
B) replicon
C) origin
D) bifurcate
```
origin
29
```
When a DNA molecule is replicated, the daughter molecules contain one strand of parental DNA and one strand of newly synthesized DNA; this is called ________ replication.
A) hemiconservative
B) conservative
C) semiconservative
D) dispersive
```
C) semiconservative
30
```
During replication, which enzyme unwinds the two strands of the DNA molecule from one another?
A) Ligases
B) Unwindases
C) Helicases
D) Primases
```
helicases
31
```
Bacterial DNA replication occurs at a rate of ________.
A) 750–1,000 base pairs per second
B) 750–1,000 base pairs per minute
C) 50–100 base pairs per second
D) 50–100 base pairs per minute
```
750-1000 base pairs per second
32
```
Which of the following is not present in DNA?
A) Alpha carbon
B) 5'-carbon
C) Minor groove
D) 3'-hydroxyl
E) Double helix
```
alpha carbon
33
The basic differences between RNA and DNA reside in their sugar and pyrimidine bases;
RNA has ribose and uracil whereas
DNA has deoxyribose and thymine.
TRUE
34
The B form of the DNA double helix contains a wider major groove and a narrower minor groove because the two polynucleotide strands are not positioned directly opposite one another in the helical cylinder.
true
35
```
Which of the following nitrogenous bases is usually found in RNA but not in DNA?
A) Adenine
B) Thymine
C) Uracil
D) Guanine
```
uracil
36
```
Which of the following is NOT a pyrimidine?
A) Adenine
B) Cytosine
C) Thymine
D) Uracil
```
adenine
| its a purine
37
```
Which of the following is not a complementary base pair found in DNA molecules?
A) Adenine-thymine
B) Guanine-cytosine
C) Adenine-uracil
D) All of the choices are correct.
```
Adenine-uracil
