What would you expect the optimum pH to be for the salivary enzyme amylase, which digests starches into sugars?
What will be an ideal response?
pH for optimum salivary amylase would be close to neutral.
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Heavy harvesting of which species during the 1970s reduced the population to about one percent of its original size?:
a. Bombus occidentalis, the western bumblebee b. Haliotis sorenseni, the white abalone c. Juga newberryi, a freshwater snail d. Pyrgulopsis owyheensis, a springsnail e. Capnia kersti, a stonefly
A man inherited a chromosome with a deletion that removes a tumor-suppressor gene. The protein encoded by this gene normally functions in DNA damage repair. Which series of events would be most likely to lead to cancer?
A) Loss-of-heterozygosity of the tumor-suppressor gene followed by driver mutations in two different proto-oncogenes B) A loss-of-function mutation in a proto-oncogene followed by a gain-of function mutation in a tumor-suppressor gene C) Loss-of-heterozygosity of the tumor-suppressor gene followed by passenger mutations in several genes of unknown function D) A gain-of-function mutation in a proto-oncogene followed by a chromosomal duplication of a region including a tumor-suppressor gene that functions the G1-to-S checkpoint
Which of the following statements concerning bacterial growth at high temperatures is not true?
A) High temperatures denature enzymes B) High temperatures are microbistatic C) High temperatures are microbicidal D) High temperatures destroy lipids
Xylem tissue may contain each of these cell types, except which?
A. Rays B. Sieve cells C. Fibers D. Vessel members E. Tracheids