The pellicle of a Euglena cell consists of
A. protein strips and microtubules.
B. peptidoglycan.
C. glycoprotein.
D. polysaccharide.
Answer: A
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English ivy (Hedera helix) and wintercreeper (Euonymus fortunei) are not closely related, yet both have aerial rootlets that allow them to climb up and stick to bark on trees. What type of evolution is this?
A. Analogous. B. Convergent. C. Radial. D. Bivalent. E. Both analogous and convergent.
The distribution of different organisms over the
surface of the earth a. offers evidence for evolution. b. provides evidence for a single center of evolution. c. appears to be simply a matter of chance. d. is not affected by biogeographical features. e. is primarily the result of human activities.
Which of the following operations will NOT increase the industrial lysine production?
A) using a bacterial strain in which aspartokinase does not bind to S-aminoethylcysteine (AEC), an aspartokinase inhibitor. B) increasing the concentration of S-aminoethylcysteine (AEC), an aspartokinase inhibitor, in the fermentor. C) fermenting with a bacterial strain that contains mutations in the allosteric site of aspartokinase. D) increasing the precursor (aspartate) concentration. E) growing the lysine producing bacterium in a chemostat with constant removal of lysine
Which one of the following is not an effect of complement activation?
A. Formation of a membrane attack complex B. Attraction of phagocytes C. Lysis of the cell through cytoplasmic leakage D. Enhanced T-lymphocyte activity through thymus gland interaction E. Production of C3b opsonin