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In mammals, hematopoietic stem cells that give rise to different types of blood cells are known as
(A) totipotent stem cells.
(B) pluripotent stem cells.
(C) myeloid progenitor cells.
(D) lymphoid progenitor cells.
Which one of the following metabolic intermediates is common to glycolysis, nucleotide synthesis, and glycogen synthesis?
(A) Citrate
(B) Oxaloacetate
(C) Glucose 6-phosphate
(D) Glycerol 3-phosphate
Mammalian cells cultured at low temperature (25 to 30°C) lead to an increased sterol content in the membrane. Elevated sterols in the membrane result in
(A) an enhancement in membrane fluidity.
(B) stabilization of membrane proteins.
(C) an increase in membrane permeability to water.
(D) a decrease in membrane fluidity.
Which one of the following pairs of amino acids is NOT incorporated in a polypeptide chain?
(A) 4-Hydroxyproline and γ-carboxyglutamate
(B) γ-Carboxyglutamate and desmosine
(C) Ornithine and citrulline
(D) 4-Hydroxyproline and 5-hydroxylysine
Which of the following is/are true about Retrovirus?
(A) It contains double-stranded RNA genome
(B) It can cause cancer
(C) It contains reverse transcriptase
(D) It contains double-stranded DNA genome
Which of the following is/are trace element(s)?
(A) Mn
(B) P
(C) S
(D) Zn
Which of the following entity(ies) is/are found inside the intact nucleus of eukaryotic cells?
(A) Centrosome
(B) Lysosome
(C) Nucleolus
(D) Nucleosome
Which of the following technique(s) can be used to determine the three-dimensional structure of an organic compound?
(A) Mass spectrometry
(B) NMR spectroscopy
(C) UV-visible spectroscopy
(D) X-ray crystallography
Which of the following statement(s) about the effect of genetic drift is/are correct?
(A) It can cause changes in the frequency of alleles at random
(B) It is a mechanism of evolution
(C) It can lead to loss of genetic variation within small populations
(D) It is significant in large populations
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