Misc question Flashcards
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
d) translation
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.
D) A tRNA molecule translocates from the P site to the E site.
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) Translation begins with formation of the 30S initiation complex.
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) bacteria
\_\_\_\_\_\_\_\_ 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)
tRNA
How many different termination codons are used in translation? A) One B) Two C) Three D) Four
c) three
How many RNA codons encode 60 amino acids? A) 60 B) 180 C) 20 D) 30
60
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) UGA, UAG, UAA
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
anticodon
Which of the following is the initiator codon? A) AUG B) UAA C) UAG D) UGA
AUG
Which of the following is not a termination codon? A) AUG B) UAA C) UAG D) UGA
AUG
initiator codon
The genetic code is translated in groups of \_\_\_\_\_\_\_\_ bases. A) two B) three C) four D) five
three
The stop codons are translated codons; that is, they specify amino acids to be inserted into the last position of a growing polypeptide chain.
false
During transcription elongation, how many pyrophosphate molecules are produced from the incorporation of 20 ribonucleoside monophosphates? A) 20 B) 40 C) 60 D) 5
20
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
3, 4, 1, 2, 5
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
transcription
The transcribed and translated region of a gene is the \_\_\_\_\_\_\_\_ region. A) leader B) promoter C) coding D) trailer
coding
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.
none
The region at which the RNA polymerase binds is the \_\_\_\_\_\_\_\_ region. A) leader B) promoter C) coding D) trailer
promoter
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
bacteria
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
template
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
oric site
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
fork
Choose the correct order of proteins that function in the initiation, elongation, and termination stages of DNA replication.
DnaA, DNA polymerase III, DNA polymerase I, DNA ligase
During DNA replication, deoxyribonucleosides are added to the 5’ end of Okazaki fragments and to the 3’ end of the leading strand.
false
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
Which enzyme is a topoisomerase? A) DNA gyrase B) DNA ligase C) DNA polymerase I D) DNA polymerase III
dna gyrase
a top gyrates
Each chromosome has one or more \_\_\_\_\_\_\_\_ site(s) where replication begins. A) promoter B) replicon C) origin D) bifurcate
origin
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
During replication, which enzyme unwinds the two strands of the DNA molecule from one another? A) Ligases B) Unwindases C) Helicases D) Primases
helicases
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
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
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
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
Which of the following nitrogenous bases is usually found in RNA but not in DNA? A) Adenine B) Thymine C) Uracil D) Guanine
uracil
Which of the following is NOT a pyrimidine? A) Adenine B) Cytosine C) Thymine D) Uracil
adenine
its a purine
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
