What is an example of acclimatization?

A. sweating while working out
B. a dog moving into the shade
C. a dog panting on a hot day
D. young penguins huddling together to stay warm
E. a duck growing thick down under feathers in fall


E. a duck growing thick down under feathers in fall

Biology & Microbiology

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Deleterious alleles are eliminated from populations by

A) natural selection. B) mutation. C) nonrandom mating. D) genetic drift.

Biology & Microbiology

In protein synthesis, which RNA molecule completes the first task?

A. mRNA D. dRNA B. rRNA E. A combination of more than one of these. C. tRNA

Biology & Microbiology

Given the following mRNA sequence, what is the amino acid sequence for the corresponding polypeptide? 5? - AUG CGA UUU GGG UGC UAG - 3?

A) 5?-Met-Arg-Phe-Gly-Stop-3? B) C—Met-Arg-Leu-Glu—N C) N—Met-Arg-Phe-Gly-Cy—C D) N—Met-Asp-Phe-Gly-Trp—C E) N—Arg-Phe-Gly-Stop—C

Biology & Microbiology

Answer the following questions true (T) or false (F)

1. Laboratory experiments suggest that many of the kinds of organic molecules needed to form the first forms of life could have been made nonbiologically in Earth's early history. 2. Some of the more advanced organisms in Domains Bacteria and Archaea have a nucleus. 3. Photosynthesis was first performed by bacteria about 3.4 billion years ago.

Biology & Microbiology