1. The expansion of one cell sheet over other cells during early embryonic development is called
a) epiboly
b) ingression
c) delamination
d) involution
2. In the alpha helix, the hydrogen bonds
a) are perpendicular to the helix axis
b) occur between the side chains
c) are roughly parallel to the helix axis
d) occur between only some of the amino acids
3. Identify the prochiral molecule in the citric acid cycle
a) Oxaloacetate
b) Citrate
c) Isocitrate
d) Succinate
4. λ phage can tranduce bacterial genes only at or near the gene involved in
a)galactose utilization
b) CAP
c) galactose repressor
d) repressor synthesis
5. The hydrolysis of GTP is caused by the transduction of the newly formed peptidyl-tRNA in the A site into the P site by
a) eEF-2
b) eEF-3
c) eIF-S
d) eIF-2
6. The enzymes which do not conform to Michaelis Menten kinetics such as asparate transcarbamolase are called
a) rennins
b)amylases
c) trypsins
d) allosteric enxymes
7. According to the clonal selection theory
a) an antibody changes its shape after binding to the antigen
b) there is no clonal selection in B cells
c) the animal contains many types of B cells, each producing one kind of antibody
d) each B cell produces many types of antibodies
8. Sympatric species are often similar in appearance because
a) appearances are often of little evolutionary significance
b) the genetic changes accompanying speciation are often small
c) the genetic changes accompanying speciation are often large
d) the traits that differ among species are not the same as the traits that differ among individuals within the species
9. Archaeopteryx is known as the missing/ connecting link because it is a fossil and has characters between
a) birds and reptiles
b) reptiles and mammals
c) chordates and non chordates
d) fishes and mammals
10. Histamine is released by
a) macrophages
b) mast cells
c) basophils
d) lymphocytes
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Answers:
1. a) epiboly
2. c) are roughly parallel to the helix axis
3. b) Citrate
4. a)galactose utilization
5. a) eEF-2
6. d) allosteric enxymes
7. c) the animal contains many types of B cells, each producing one kind of antibody
8. d) the traits that differ among species are not the same as the traits that differ among individuals within the species
9. a) birds and reptiles
10. b) mast cells