Living members of the ____ lineage have fins supported by thin and flexible bony rays
a. Petromyzontoidea
b. Chondrichthyes
c. Actinopterygii
d. Myxinoidea
e. Sarcopterygii
ANSWER: c
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Which cells complete their maturation in the thymus gland?
a. T cytotoxic cells only b. T helper cells only c. B cells only d. Both T cytotoxic and T helper cells e. T cytotoxic cells, T helper cells, and B cells
In humans, the majority of cells in the body are ______.
a) haploid gametes b) diploid somatic cells c) diploid gametes d) haploid somatic cells
What prompts a newborn baby to start to breathe?
A) an increase in the concentration of carbon dioxide in the baby's blood B) a decrease in the concentration of oxygen in the baby's blood C) a change in the temperature on the surface of the skin D) exposure to air
Replication of the DNA occurs during
A) metaphase. B) prophase. C) telophase. D) anaphase. E) interphase.