Molecular studies have found that the knotted-1 (KN-1) gene normally causes knobby growth
a. True
b. False
ANSWER: False
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RNA viruses require their own supply of certain enzymes because _____
A) host cells rapidly destroy the viruses B) host cells lack enzymes that can replicate the viral genome C) these enzymes translate viral mRNA into proteins D) these enzymes penetrate host cell membranes E) these enzymes cannot be made in host cells
The ____ are potentially pathogenic to humans
a. Archaea
b. Bacteria c. Archaea and Bacteria d. cyanobacteria e. methanogens
What is the basic problem with artificial
cloning of adult cells?
a. adult cells are already differentiated b. adult cells do not divide c. adult cells have too many mutations d. adult cells only have a subset of the original embryonic DNA e. more than one of these is a basic problem with the artificial cloning of adult cells
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 required to support other cells growing on top of the tissue. D. Epithelial tissues are programmed to stop dividing after only a few cell cycles. E. Epithelial tissues play a critical role in transport, and must be thin to allow diffusion to occur.