Specialized cells regulate the expression of genes because they
a. do not want genes to become worn out
b. do not need the proteins that are specified by certain genes
c. cannot control the translation of proteins
Ans: b. do not need the proteins that are specified by certain genes
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How many cell types would we expect to find in the simple primary tissues of plants?
A. One or two simple cell types. B. Several cell types. C. Many cell types. D. This cannot be generalized.
Which are the four types of animal tissues that develop into specialized structures?
a. Nervous, muscle, connective, and epithelial b. Nervous, transport, connective, and epithelial c. Nervous, muscle, reproductive, and connective d. Nervous, muscle, reproductive, and epidermal
Which of the following molecules is NOT a
steroid?
a. testosterone b. estrogen c. glycerol d. cholesterol e. vitamin D
Both the nucleus in the head of the sperm and the mitochondria in the midpiece of the sperm include genetic information (DNA) about the father. The offspring, however, contains only nuclear DNA from the father but both mitochondrial and nuclear DNA from
the mother. Why does the newborn lack the father's mitochondrial DNA? What will be an ideal response?