A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. Which is the largest among the followings?
A. Nucleotide
B. Nitrogenous base
C. Phosphate
D. Carbon
2. Which is the only amino acid that undergoes significant amount of oxidative deamination in the hepatic mitochondira?
A. Lysine
B. Alanine
C. Threonine
D. Glutamate
3. If more than one codon codes for same amino acid, this phenomenon is known as
A. Degeneracy
B. Frame-Shift Mutation
C. Transcription
D. Mutation
4. The symptoms of retinol excess are
A. bone fragility
B. nausea
C. weakness
D. all of these
5. Which of the following organic groups are found in naturally occuring amino acids?
A. Guanidinium ion
B. Indole
C. Imidazole
D. All of these
6. A deficiency of thiamin produces the disease known as
A. beri-beri
B. scurvy
C. cataract
D. anemia
7. Which of the following organelles is directly connected to the outer membrane of the nucleus in a eukaryotic cell?
A. Mitochondrion
B. Lysosome
C. Golgi apparatus
D. Endoplasmic reticulum
8. Sex lethal (sxl) in Drosophila is transcribed when
A. the X autosome balance is less than 0.5
B. the X autosome balance is 1 or greater
C. the X autosome balance equals 0.5
D. none of the above
9. The model that is now known to be correct for the structure of biological membrane is
A. Fluid mosaic model
B. Page's model
C. Lac Operon model
D. Lock and Key model
10. The nitrogen atoms of urea produced in the urea cycle are derived from
A. nitrate
B. ammonia and aspartic acid
C. nitrite
D. ammonia
11. Cholesterol is somewhat amphipathic due to
A. the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule
B. the long branched hydrocarbon along with the four hydrocarbon rings
C. the five-methyl groups along with the hydrocarbon chain
D. the three six-membered rings along with the single five-membered ring
12. Which of the following techniques was carried out by Nirenberg and Matthaei in 1961 to determine the first codon?
A. In vitro synthesis of a polypeptide using UUUUU
B. Labeled peptide binding to a ribosome
C. Mixed co-polymer mRNA synthesis
D. none of the above
13. A molecule that can be covalently linked to a non-immunogenic antigen to make it an immunogen is called a (n)
A. adjuvant
B. carrier
C. hapten
D. mitogen
14. Which of the following amino acids can interact with the DNA or RNA nucleotide bases via hydrogen bonding?
A. Asn and Gln
B. Cys and Met
C. Lys and Leu
D. Ile and Val
15. During the unfolding reaction of a helix, breakage of each hydrogen bond requires about 2kJ/mol. This implies hydrogen bonds are
A. much stronger in proteins than in water
B. not reformed with water
C. slightly weaker in proteins than in water
D. slightly stronger in proteins than in water
16. FAD is reduced to FADH2 during
A. electron transport phosphorylation
B. lactate fermentation
C. Krebs cycle
D. glycolysis
17. The GC trace obtained after an experiment is called a
A. chromatograph
B. chromatogram
C. chromatophore
D. graph
18. Eukaryotic mRNA binding to the ribosomes is facilitated by __________ .
A. the Shine Dalgarno sequence
B. the 7-methyl guanosine cap
C. tRNA
D. poly A tail
19. The pH of a solution is determined by
A. concentration of salt
B. relative concentration of acids and bases
C. dielectric constant of the medium
D. environmental effect
20. Column efficiency is measured in terms of number of plates which is
A. inversely related to the square of the peak width
B. directly related to the square of the peak width
C. inversely related to the cube root of the peak width
D. directly related to the square of the peak width
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