Hfr cells can integrate the F factor and some genes into the bacterial chromosome. How do Hfr cells accomplish this?
a. through crossing-over
b. through mitosis
c. through meiosis
d. through prophase
Ans: a. through crossing-over
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Coevolved pollinators receive __________, pollen,
or another reward for visiting a flower. Fill in the blank(s) with the appropriate word(s).
Age-related changes in systems other than the nervous system include
a. a decrease in the size of the heart. b. a break down of alveolar walls in the lungs. c. the buildup of cholesterol plaques in blood vessels. d. a decrease in blood transport to organs. e. all of these.
Partial or complete loss of hearing (deafness) can be caused by damage to the _____
I) axons of the neurons associated with each hair cell that carry information to the brain II) hair cells (the sensory receptors) in the cochlea III) tympanic membrane, or eardrum A) only II B) only III C) only I and II D) I, II, and III
Which of the following statements characterize heterospory?
A. It involves production of two different kinds of spores, one growing into male gametophytes and the other into female gametophytes. B. It increases the chance of cross-fertilization. C. It increases the potential for genetic variation and aids evolutionary flexibility. D. It involves production of two different types of spores from a single sporangium. E. It occurs in seed plants and seedless vascular plants.