Quick Biochemistry - Nucleic Acids (Section 7)
1
What type of RNA is produced by RNA polymerase I in mammals?
2
Which type of RNA is synthesized by RNA polymerase III in mammals?
3
In mammals, which enzyme is responsible for creating mRNA?
4
What molecule serves as the starting material for mRNA production?
5
Which of the following is NOT a step in the modification of hnRNA after transcription?
پاسخ دهید(C)
Insertion of new nucleotides
6
Which of the following is NOT a change that happens to tRNA after it is first made?
پاسخ دهید(D)
Addition of a specific sequence at the end
7
In which of the following does post-transcriptional modification NOT take place?
8
The TATA box, a specific DNA sequence, is a binding site for what enzyme?
پاسخ دهید(B)
DNA-dependent RNA polymerase
9
Which of the following mRNA types does NOT have a polyadenylate tail?
10
In which of the following organisms are introns found in their DNA?
11
Which of the following is a DNA polymerase found in mammals?
12
Where in a mammalian cell is DNA polymerase γ typically found?
13
In mammals, what enzyme primarily facilitates the duplication of genetic material within the cell's core?
14
Which enzyme exhibits primase function?
15
Which mammalian DNA polymerase plays a key role in rectifying mistakes during DNA replication?
16
What cellular component's production is disrupted by Novobiocin?
17
The synthesis of which molecule is hindered by Ciprofloxacin?
18
What molecular target is inhibited by Ciprofloxacin?
19
Which cellular process is impaired by Rifampicin?
پاسخ دهید(D)
Initiation of transcription
20
To which molecule does Actinomycin D specifically attach?
21
Certain DNA segments exhibit palindromic properties and
پاسخ دهید(C)
Are targeted by specific enzymes for cutting
22
Within genes, introns represent
پاسخ دهید(C)
Non-coding regions not translated into proteins
23
Which statement regarding tRNA processing is incorrect?
پاسخ دهید(C)
A specific cap is added to the 5' end
24
The impact of α-Amanitin primarily affects
پاسخ دهید(C)
RNA polymerase in eukaryotes
25
The function of Ciprofloxacin is to block the creation of
26
Which is NOT a characteristic of bacterial promoters?
پاسخ دهید(D)
Contains a region with a high melting temperature
27
Which of the following statements about eukaryotic promoters is incorrect?
پاسخ دهید(A)
They can be positioned before or after the gene
28
In the method used to identify DNA sequences developed by Sanger, the replication process is halted by the introduction of
پاسخ دهید(B)
Another specific modified nucleotide
29
Where are the promoters for tRNA genes typically situated?
30
Regarding tRNA, which of the following statements is false?
پاسخ دهید(D)
The genes for rRNA occur in single copies
31
Where can you find anticodons?
32
On which molecule can you locate codons?
33
Where are stop codons typically found?
34
What is a characteristic of the genetic code that allows it to be called degenerate?
پاسخ دهید(D)
More than one codons can code for the same amino acids
35
Which statement about the genetic code is incorrect?
36
Which statement about stop codons is false?
پاسخ دهید(C)
They are identical in nuclear and mitochondrial DNA
37
Which type of cell typically has polycistronic mRNA?
38
In which organisms would you typically find genes with non-coding sequences?
39
What term is used to describe the non-coding parts of a gene?
40
Where would you find splice sites?
41
Which of the following is NOT a common characteristic of introns?
پاسخ دهید(C)
The terminal AG sequence is followed by a region rich in purines
42
A spliceosome includes all of the following components EXCEPT:
43
Self-splicing can be observed in:
44
Where is the Pribnow box located?
پاسخ دهید(A)
In promoters of prokaryotes
45
Where is the Hogness box found?
پاسخ دهید(B)
In promoters of eukaryotes
46
What is the typical location of the CAAT box relative to the transcription start site in eukaryotic promoters?
پاسخ دهید(D)
Eukaryotic promoters 70-80 bp upstream
47
Which of the following is/are present in eukaryotic promoters?
48
Which of the following statements about tRNA is NOT accurate?
پاسخ دهید(B)
The anticodon of tRNA recognizes the amino acid
49
Which of the following is INCORRECT regarding the charging of tRNA?
پاسخ دهید(B)
ATP is converted to ADP and inorganic phosphate during the process
50
Which of the following is NOT true regarding the recognition of a codon on mRNA by an anticodon on tRNA?
پاسخ دهید(D)
Wobble leads to incorporation of incorrect amino acids in the protein
