The effect of smoking on the respiratory tract includes
a. reduced production of mucus.
b. increased development of cells.
c. immobilization of ciliated cells.
d. destruction of white blood cells that patrol the respiratory tract.
e. both immobilization of ciliated cells and destruction of white blood cells that patrol the
respiratory tract.
E
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We have a family of genes that code for different forms of myosin. How could this family of genes have arisen?
A. There is duplication of the original myosin gene, and the resulting copies have diverged. B. Two different original genes accumulated mutations and converged on myosin. C. There is duplication of the original myosin gene without divergence. D. Lateral gene transfer from a bacterium occurs as a result of infection.
The principle of independent assortment states that:
A. when gametes are formed, the two members of a gene pair will separate equally into gametes. B. when gametes are formed, the two members of a gene pair assort together in gametes. C. segregation of one set of alleles of a gene pair assort with the alleles of another gene pair. D. segregation of one set of alleles of a gene pair assort independently of another gene pair.
A mycologist visits your biology class and discusses her research on a particular fungus that lives on the bark of damaged spruce trees. She explains that the fungal hyphae of her research organism is heterokaryotic. You raise your hand and request that she define that word. Her correct response is
A. heterokaryotic means that the nuclei of the fungal hyphae are genetically the same. B. heterokaryotic means that the nuclei of each compartment of the hyphae are genetically distinct. C. heterokaryotic means that each compartment of the hyphae contain two distinct nuclei. D. heterokaryotic means that each compartment of the hyphae contains only one nucleus.
The events of binary fission are I. the cell doubles in size II. the DNA is replicated III. the cell forms a septum IV. the cell separates from its offspring The correct order of these events is
A) I, III, II, IV. B) II, III, I, IV. C) IV, I, III, II. D) II, I, III, IV. E) I, II, IV, III.