What popular belief of the time did Lyell's theory of uniformity challenge?
a. Fossils are not evidence of extinct species.
b. The Earth is only 6,000 years old.
c. The Earth does not change over time.
d. Species do not change over time.
e. All animals exists in perfect form.
b
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One important adaptation of mammals is hair growing out of the skin for retaining heat. How does hair help mammals retain heat?
a. Hair increases the surface area exposed to the sun, capturing more heat from the environment. b. Hair covers the body like a coat, keeping out the cold and stopping evaporative cooling. c. Hair traps a boundary layer of air close to the body, retaining heat generated by metabolic processes. d. Hair’s dark color captures more light, and light is energy, allowing mammals to capture energy to heat the body.
Analysis of the nucleotide sequence of the genome of microorganisms has revealed important information about their metabolic potential.
Answer the following statement true (T) or false (F)
What is the purpose of molecular chaperones?
a. To transfer an amino acid b. To attach a carboxyl group c. To straighten other molecular proteins d. To strengthen the tertiary structure of a protein e. To assist the folding of other molecular proteins
The development of secondary sexual characteristics is due to
A) decreased levels of GnRH. B) increased levels of estrogen or testosterone. C) increased levels of progesterone. D) decreased levels of estrogen or testosterone. E) decreased LH levels.