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. Arachidonate has 20 carbon atoms with
A. 3 double bonds 
B. 2 double bonds 
C. 4 double bonds 
D. 8 double bonds 

2. 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 

3. Aspartame is made up of
A. Asparagine and methionine 
B. Aspartate and phenylalanine 
C. Asparagine and phenylalanine 
D. Aspartic acid and methionine 

4. 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 

5. The sequence of amino acids in proteins can be determined by means of
A. All of the above 
B. Partial cleavage of the original polypeptide into smaller polypeptides 
C. Identification of the -NH2 terminal amino acids 
D. Identification of the -COOH terminal amino acids 

6. Nucleoside is a pyrimidine or purine base
A. Covalently bonded to a sugar 
B. Ionically bonded to a sugar 
C. Hydrogen bonded to a sugar 
D. None of the above 

7. Oxidation of a molecule involves
A. Gain of electron 
B. Loss of electron 
C. Gain of proton 
D. Loss of proton 

8. Sphingomyelinase deficiency is seen in:
A. Krabbe's disease 
B. Tay Sach's disease 
C. Niemann - pick disease 
D. Farber's disease 

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

10. 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 

11. Cholesterol is essential for normal membrane functions because it
A. Keeps membranes fluid. 
B. Cannot be made by higher organisms 
C. Spans the thickness of the bilayer 
D. Plugs up the cardiac arteries of older men 

12. Which of the following structures is expected in a bacterium?
A. Nucleus 
B. Plasma membrane 
C. Golgi apparatus 
D. Endoplasmic reticulum 

13. The general expression for the appearance of a solute in an effluent is (where V is the elution volume of a substance , V0 void volume, kD distribution constant and Vi internal water volume)
A. V = V0 + kDVi 
B. V = V0/Vi 
C. V = V0 - kDVi 
D. V/V0 = kDVi 

14. Which of following RNA characteristically contains unusual purines and pyrimidmes?
A. RRNA 
B. NRNA 
C. MRNA 
D. TRNA 

15. In the intersystem crossing
A. All of the above 
B. The spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa) 
C. A molecule converts excess electronic energy to vibrational energy 
D. A molecule converts its excess energy to light, and emits a photon 

16. In ureotelic animals, carbamoyl group are transferred to
A. Urea 
B. Uric acid 
C. Ornithine 
D. Creatine 

17. Which of these genes codes for a protein that plays a role in white blood cell function?
A. DCP1 
B. MPO 
C. GLUT4 
D. RP13 

18. The binding of lac repressor to DNA could be considered to be analogous to
A. Mixed-type inhibition of an enzyme 
B. Uncompetitive inhibition of an enzyme 
C. Allosteric effects in enzyme regulation 
D. Competitive inhibition of an enzyme 

19. Bacterial protein called catabolic activator protein (CAP) is an example of
A. Negative control of gene expression 
B. Positive control of gene expression 
C. Second type of positive control of gene expression 
D. None of the above 

20. What is a protein produced by host cells infected by viruses?
A. Interferon 
B. Histamine 
C. Antiserum 
D. Vaccine 

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