Mcq Subject: Biochemistry
Essential fatty acid present in breast milk which is required for normal growth of child is:
A. Lenoleic acid
B. Palmitic acid
C. Docosahexanoic acid
D. EPA
View DescriptionIn a reaction substrate is available in a concentration that is l000times the Km value of the enzyme. After 9 minutes of reaction, l7o substrate is conveed to product (12 microgram/ml). If the concentration of the enzyme is changed to 1/3 and concentration of substrate is doubled. What is the time taken to conve the substrate into the same amount of product, i.e. I 2microgram/ml?
A. 9 minutes
B. 4.5 minutes
C. 27 minutes
D. 13.5 minutes
View DescriptionWhich of the following doesn’t occur in 5′ to 3′ direction?
A. DNA repair
B. DNA replication
C. RNA editing
D. Transcription
View DescriptionWhich of the following vitamin is synthesized in vivo, in the body by humans?
A. Niacin
B. Pantothenic acid
C. Cyanocobalamin
D. Folic acid
View DescriptionWhich of the following statements about tRNA molecules is false?
A. The enzyme that attaches an amino acid to a tRNA is aminoacyl-tRNA synthetase
B. Although composed of a single strand of RNA, each molecule contains several sho, double-helical regions
C. The amino acid attachment is always to 3' end of the molecule.
D. There is at least one tRNA for each of the 2 amino acids
View DescriptionA lady presented with fatigue and tingling sensation in both hands and legs. On examination, she is found to have a fissured red tongue, lesions at angle of mouth and peripheral neuropathy with a decreased RBC glutathione reductase activity. What is the likely deficient vitamin?
A. Riboflavin
B. Vitamin B12
C. Thiamine
D. Vitamin B6
View DescriptionDeficiency of nicotinic acid results in:
A. Beri-beri
B. Pellagra
C. Night blindness
D. Pernicious anemia
View DescriptionWhich of these is not a cofactor for glycogen phosphorylase, an impoant enzyme of the glycogenolysis pathway?
A. Calmodulin
B. c-AMP
C. Protein Kinase A
D. Glycogenin
View DescriptionIn which of the inheritance, if father is affected no offspring is affected, but if mother affected, all offspring affected?
A. Mitochondrial
B. X linked recessive
C. Autosomal dominant
D. Autosomal recessive
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