Quick Biochemistry - Nucleic Acids (Section 1)
1
What components combine to form a nucleoside?
إجابة(B)
A purine or pyrimidine base and a sugar
2
Which of the following best describes the composition of a nucleotide?
إجابة(B)
A purine and pyrimidine base, a sugar, and phosphorous
3
Which of the following is classified as a purine nucleotide?
4
Which option represents a pyrimidine nucleotide?
5
Adenine is also known as:
6
What is the other name for 2, 4-Dioxypyrimidine?
7
What is the chemical designation for guanine?
8
In what units are the concentrations of nucleotides and nucleic acids frequently expressed?
9
Which pyrimidine nucleotide is involved in high-energy intermediate reactions?
10
In a nucleotide, what carbon position on the pentose molecule is involved in an ester bond with phosphate?
11
What molecule results from the combination of uracil and ribose?
12
Which nucleotide is most prevalent in a free state within animal cells?
13
Approximately what is the average intracellular concentration of ATP in a mammalian cell?
14
Which base is present in messenger RNA but absent in deoxyribonucleic acid?
15
What is the function of 'Caps' in an RNA molecule?
إجابة(B)
Are unique to eukaryotic mRNA
16
How does prokaryotic mRNA differ from eukaryotic mRNA?
17
What is the approximate size range of small stable RNA molecules?
18
What is the approximate range of small stable RNAs found within a single cell?
19
What is the approximate molecular weight of heterogenous nuclear RNA (hnRNA)?
20
In RNA, why isn't the guanine content always equal to cytosine, and adenine always equal to uracil?
21
Which nitrogenous base is found in RNA?
22
Which of the following is NOT a component of RNA?
23
What type of sugar is found in RNA?
24
Which statement accurately describes base pairing in an RNA molecule?
إجابة(D)
Guanine content does not necessarily equal its cytosine content.
25
In which type of RNA are methylated purines and pyrimidines typically found?
26
Where is Thymine typically found?
27
What is the approximate number of nucleotides in a tRNA molecule?
28
In a typical cell, what is the minimum number of different tRNA molecules present?
29
What shape does a tRNA molecule resemble?
30
In tRNA molecules, the CCA sequence is always located at the:
31
What is the basis for classifying Transfer RNAs?
32
Which modified base is found in the D arm of a tRNA molecule, giving it its name?
33
How many base pairs are typically found in the acceptor arm of a tRNA molecule?
34
How many base pairs does the anticodon arm of a tRNA molecule typically possess?
35
What sequence is typically found in the TΨC arm of a tRNA molecule?
36
Who put forth the double helical structure model of DNA?
37
Which of the following is NOT found in DNA?
38
What is the type of sugar molecule found in DNA?
39
DNA segments with a high concentration of A-T pairs are stabilized by how many hydrogen bonds?
40
Which statement accurately describes the base composition in a DNA molecule?
إجابة(D)
Guanine content equals cytosine content
41
DNA with a high proportion of G-C pairs tend to have what characteristic regarding hydrogen bonds?
42
Given that DNA carries an organism's genetic code, what can be logically inferred about its base composition across different tissues?
إجابة(C)
DNA from different tissues in the same organism should usually have the same base composition
43
What is the approximate width of the B-form DNA double helix in nanometers?
44
How many base pairs are typically found in a single complete turn of the B-form DNA molecule?
45
What is the distance, in nanometers, covered by one full turn of B-form DNA?
46
If the thymine concentration in a DNA molecule is 30%, what is the predicted concentration of guanosine?
47
If the guanosine content in a DNA molecule is 40%, what would be the percentage of adenine?
48
What factor leads to a higher melting temperature in duplex DNA?
49
What condition is often treated with the synthetic nucleotide analogue, 4-hydroxypyrazolopyrimidine?
50
Which synthetic nucleotide analogue is frequently used in cancer and viral infection treatment?
