The complementary base that hydrogen bonds with thymine in a DNA double helix is ________
A) uracil
B) thymine
C) guanine
D) adenine
E) cytosine
D
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What is the most accurate definition of microevolution?
a. heritable changes in the genetics of a population b. natural selection leading to adaptation c. the occurrence of a series of mutations over time d. the origin of new species through natural selection e. the origin of major new forms of life over time
Many rural communities object to nearby wilderness designations because they
A. depend on natural resources in the area. B. dislike and misunderstand wildlife. C. object to subsidies for wildlife. D. dislike having wilderness nearby. E. object to all of the campers and hikers who visit the area.
Which one of the following is TRUE regarding mature human gametes?
A) produced by the process of mitosis B) contain the haploid number of chromosomes C) produced in the testes and oviducts D) are also known as primary spermatocytes and primary oocytes E) contain 46 chromosomes
Before a sperm can compete in fertilization, it must undergo a maturation process in the female
reproductive tract known as: a. the acrosome reaction. b. the cortical reaction. c. spermatogenesis. d. determination. e. capacitation.