In the cells of a female mammal, ________ is(are) inactivated
a. either the maternal or paternal X chromosome
b. all maternal X chromosomes
c. all paternal X chromosomes
d. both the maternal and paternal X chromosomes
a
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Why do populations grow more slowly as they approach their carrying capacity?
A) Density-dependent factors lead to fewer births and increased mortality. B) Density-independent factors lead to fewer births and increased mortality. C) Hormonal changes promote higher death rates in crowded populations. D) Individuals voluntarily stop mating so that overcrowding does not occur. E) The incoming energy decreases in populations experiencing a high rate of increase.
Animal groups differ in the mechanisms by which heartbeats are initiated. Most arthropods have a _______ heart while vertebrates have a _______ heart.
A. neurogenic, myogenic B. myogenic, neurogenic C. neurogenic, cardiogenic D. cardiogenic, myogenic E. autonomous, neurally controlled
Mucus contains an enzyme called ____ that chemically attacks and kills bacteria
a. lysozyme b. peroxide c. lipase d. lactase e. protease
Naked capsid animal viruses are commonly released from the infected cell by ________, a process the host cell does not survive.
A. budding B. lysis C. endocytosis D. membrane fusion E. exocytosis