Gene flow is
A. used for comparison purposes when numbers of organisms or size of organisms would lead to confusion.
B. the optimum number of individuals of a species that can survive.
C. movement of genes within a population from place to place resulting from migration.
D. graphic expression of increasing or decreasing numbers.
C. movement of genes within a population from place to place resulting from migration.
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Which archaeal phylum contains primarily extreme halophiles and methanogens?
A) Crenarchaeota B) Euryarchaeota C) Nanoarchaeota D) Thaumarchaeota
Meiosis proceeds different in males compared to females. Which of the following best describes one of those differences?
A. The haploid cells produced by spermatogenesis are genetically diverse from the original parent cell and the haploid cells produced by oogenesis are genetically identical to the original parent cell. B. Spermatogenesis occurs in the ovaries and oogenesis occurs in the testes. C. Spermatogenesis results in the production of four haploid sperm cells and oogenesis results in the production of a single haploid egg cell. D. Spermatogenesis produces haploid cells and oogenesis produces diploid cells. E. Spermatogenesis begins while the man is still a fetus, but oogenesis does not begin until after a woman reaches puberty.
The template strand of a DNA segment that codes for mRNA has the sequence: ATGCGT. Which tRNA anticodons would pair with the mRNA that is coded for by this sequence?
A. AUG CGU. B. ATG CGT. C. UAG CGU. D. UAC GCA.
Organisms maintain dynamic homeostasis (internal balance) through behavioral and physiological mechanisms. Which of the following statements is an accurate explanation of a negative feedback mechanism used by animals to regulate body temperature?
A) Squirrels are able to cool themselves during warmer months by producing more brown fat, which contains abundant mitochondria and a rich blood supply. B) Desert jackrabbits have unusually large ears that serve as solar heat collectors to enable them to maintain their body temperatures. C) A ground squirrel's hypothalamus detects changes in environmental temperatures and responds by activating or suppressing metabolic heat production. D) A goldfish slows its movements when the water temperature is lower.