Frameshift mutations may involve
a. substitution of nucleotides.
b. substitution of codons.
c. substitution of amino acids.
d. addition or deletion of one or more base pairs.
e. none of these.
Answer: d
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Ova are
(a) male gametes. (b) female gametes. (c) specialized for motility. (d) both a and c.
The chemical nature of exotoxins is that of a
A. protein. B. carbohydrate. C. lipid. D. lipopolysaccharide.
Answer the following statements true (T) or false (F)
1. Plant cell membranes contain cholesterol. 2. Diffusion is the movement of a molecule from an area of high to low concentration. 3. Osmosis describes the movement of water from an area of high to low solute concentration. 4. Movement of molecules down their concentration gradient can drive the movement of a different molecule against its concentration gradient.
If a cofactor is not protein but another kind of organic molecule it is called a(n)
A. regulator lipid. B. coenzyme. C. substrate. D. catalyst.