Test Your Knowledge - Free MCQ PRACTICE
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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. A cell which defends against body cells in which viruses are reproducing is
A. Exotoxin
B. Cytotoxic T cell
C. Endotoxin
D. Suppressor T cell

2. Which of the following is used as carbon atom source while producing urea in the urea cycle?
A. Arginine
B. Aspartic acid
C. Carbon dioxide
D. Glucose

3. Where in a eukaryotic cell, DNA can be found?
A. Nucleus
B. Mitochondrion
C. Vacuole
D. Both (a) and (b)

4. In Hartnupís disease, the absorption of which of the following is defective?
A. Tryptophan
B. Tyrosine
C. Xanthurenic acid
D. Homogentisic acid

5. The GC trace obtained after an experiment is called a
A. chromatograph
B. chromatogram
C. chromatophore
D. graph

6. For gene transfer to be effective, transforming DNA must be
A. incorporated into the bacterial chromosome
B. incorporated into a viral genome
C. free in the bacterial cytoplasm
D. none of the above

7. Real time PCR true is used for?
A. DNA Detection only
B. RNA Detection only
C. Protein Detection only
D. DNA Detection and ampliication

8. 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

9. Tetrahydrobiopterin is required for the metabolism of
A. Arginine
B. Lysine
C. Phenylalanine
D. Serine

10. Enzyme defective in Tyrosinemia Type I is
A. Fumaryl acetoacetate hydrolase
B. Tyrosine amino transferase
C. Para hydroxyl phenyl pyruvate hydroxylase
D. Para hydroxyl phenyl pyruvic acid oxidase

11. The sugar in RNA is __________ , the sugar in DNA is __________
A. deoxyribose, ribose
B. ribose, deoxyribose
C. ribose, phosphate
D. ribose, uracil

12. How many molecules of ATPs are synthesized per NADH oxidation?
A. 2
B. 1
C. 3
D. 4

13. Lack of reaction to our own human leukocyte antigens (HLAs) is known as?
A. autoimmunity
B. complement system
C. clonal selection
D. tolerance

14. Molar absorbtivity is the measure of the
A. amount of light absorbed per unit length
B. amount of light absorbed per unit concentration
C. amount of light reflected and absorbed per unit concentration
D. None of the above

15. All of the following amino acids are converted to Succinyl-CoA EXCEPT
A. Methionine
B. Isoleucine
C. Valine
D. Leucine

16. 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

17. Which of the following immune cells would have an especially low count in a patient with advanced AIDS?
A. Killer T lymphocytes
B. Helper T lymphocyte
C. B lymphocytes
D. None of these

18. Methylation of cytosine leads to
A. Increased expression of gene
B. Decreased expression of gene
C. No effect on gene expression
D. Mutation

19. The reactions of molecules
A. are the reactions of the functional groups
B. are independent of the functional groups
C. require an enzyme in all cases
D. all of the above

20. To which of the following amino acids of target protein ubiquitin is covalently added?
A. Glycine
B. Valine
C. Serine
D. Lysine

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