In human cells such as muscle tissue, the product of anaerobic respiration is:
A. acetic acid.
B. pyruvate.
C. lactic acid.
D. FADH2.
E. ethanol.
C
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If the p53 gene is damaged, a cell can behave as though there are which of the following?
a. more mutations b. apoptotic mutations c. no mutations d. proto-oncogene mutations.
The rate of diffusion is affected by what?
Fill in the blank(s) with the appropriate word(s).
Why are epithelial membranes not very thick?
A. Epithelial tissues can only reach a certain thickness because their growth is constrained by microtubules inside the cell membrane. B. Thick epithelial tissues would collapse due to the drying effect of the environment. C. Epithelial tissues are programmed to stop dividing after only a few cell cycles. D. Epithelial tissues are required to support other cells growing on top of the tissue. E. Epithelial tissues play a critical role in transport and must be thin to allow diffusion to occur.
What is the best strategy for preserving biodiversity?
A) to depend on the Endangered Species Act to produce its intended consequences B) to prevent inbreeding in small populations C) to use genetic engineering to create new combinations of genes D) to prevent species from becoming endangered in the first place