"I wish my Dad would stop smoking! Doesn't he know that nicotine inhibits the _________ lining his trachea, and when they stop moving, bacteria and viruses can settle down into his lungs causing pneumonia and emphysema?"
A. cellular respiration
B. mitochondria
C. cilia
D. lysosomes
C. cilia
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Which of the following human populations likely evolved lactase persistence?
a. populations living on islands b. populations in which milk is a component of the diet throughout an individual’s life c. populations in which milk-derived products are essential for young individuals d. Lactase persistence will evolve in any population that has a strong need for digesting milk.
Radioactive isotopes have ____
a. excess electrons b. excess protons c. excess neutrons d. insufficient neutrons e. insufficient protons
In peas, the round allele is dominant over the wrinkled allele. A plant with round peas was crossed to a plant with wrinkled peas and all of the resulting plants had round peas. What is the genotype of the parents in this cross?
A) RR × rr B) RR × Rr C) Rr × rr D) Rr × Rr E) rr × rr
In angiosperms, an unusual reproductive process involving two sperm cells occurs, called
A. self-pollination. B. germination. C. pollen tube formation. D. double fertilization.