Cavener and Clegg (1981 ) demonstrated natural selection by observing the cumulative change in allele frequencies in populations of Drosophila melanogaster that were subjected to high levels of ________
A) mercury
B) carbon dioxide
C) alcohol
D) sugar
E) nitrous oxide
C
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In some specialized cells of eukaryotes, a very high level of gene expression can be achieved when DNA is copied repeatedly without cell division for example, some insect larvae maximize production of salivary proteins by means of this process:
a. activators binding to enhancers. b. polytene chromosomes. c. transport protein binding. d. expression of micro RNA. e. post translational modifications.
Cows are able to survive on a diet consisting almost entirely of cellulose because
A. cows have cellulose-digesting, symbiotic microorganisms in their rumens. B. cows are autotrophic. C. unlike humans, the saliva the cow produces has enzymes capable of digesting cellulose. D. cows can manufacture all 20 amino acids out of sugars in the liver.
Antibodies belong to a group of compounds called:
A. self-recognizing compounds B. virulent bases C. anti-steroids D. immunoglobulins
The C4 pathway ____.
A. produces large amounts of carbohydrates B. is less efficient than the C3 pathway C. is the mechanism of photorespiration D. involves the activity of rubisco E. fixes carbon twice