Crenarchaeota may carry out EACH of the following metabolic processes EXCEPT
a. aerobic respiration with H2 as an electron donor and oxygen as an electron acceptor.
b. anaerobic respiration with H2 as an electron donor and elemental sulfur (S0) as an electron acceptor.
c. photosynthesis.
d. fermentation of peptides.
Answer: C
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Which of the following is not true of RNA processing?
A. RNA splicing can be catalyzed by spliceosomes. B. Nucleotides may be added at both ends of the RNA. C. Exons are cut out before mRNA leaves the nucleus. D. A primary transcript is often much longer than the final RNA molecule that leaves the nucleus. E. Ribozymes may function in RNA splicing.
A snail in your garden and an oyster are quite different in appearance. What would be evidence to justify grouping them together?
A. Both use a radula for feeding. B. Both use siphons to obtain oxygen. C. Both have sensory antenna. D. Both have a mantle capable of secreting calcium carbonate.
Which of the following methods would be used to measure the concentration of bacterial contamination in processed peanut butter?
a. turbidity measurement b. total plate count c. dry weight measurement d. direct counting of bacteria on a calibrated slide under the microscope
A friend declares that chromosomes are held at the metaphase plate by microtubules that push on each chromosome from opposite sides
Which of the following observations does not support your belief that the microtubules are pulling on the chromosomes? (a) the jiggling movement of chromosomes at the metaphase plate (b) the way in which chromosomes behave when the attachment between sister chromatids is severed (c) the way in which chromosomes behave when the attachment to one kinetochore is severed (d) the shape of chromosomes as they move toward the spindle poles at anaphase