Which of the following is NOT characteristic of the rickettsias?
A. presence of a lipopolysaccharide membrane
B. not motile
C. absence of peptidoglycan
D. parasitic in cytosol
E. aerobic
Answer: C
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Environmental influences appear to contribute to cellular mutations that lead to tumor growth. For example, certain diets lead to higher incidence of colon cancers, and overexposure to sunlight leads to higher incidence of skin cancers
The tissues in closest contact with a carcinogen or mutagen (anything that causes genetic mutations) are obviously the ones most likely to develop tumors. Carcinomas and melanomas account for well over half of all cancers. What type of tissue would you guess the term carcinoma and melanoma is most closely associated with? A) connective B) muscle C) epithelial D) nervous
Various forms of a single gene at a given locus
is called a. kinetochores. b. alleles. c. autosomes. d. loci. e. chromatids.
Four of the five choices listed below are steps in the
process of transcription. Select the exception. a. cap put on one end b. introns snipped out c. action by DNA polymerase d. poly-A tail placed on one end e. exons spliced together
Which statement about the structure of neurons is true?
a. Dendrites carry impulses away from the cell body. b. Axons may form branches known as collaterals. c. Nerve impulses travel down the axon toward the cell body. d. Dendrites are often myelinated for faster conduction. e. Synapses occur between the cell body and its axon.