Skin color is an example of a human trait influenced by natural selection. What factor(s) has/have directly shaped variation in skin color? Select all that apply

A. temperature
B. disease
C. diet
D. intensity of sunlight


D

Biology & Microbiology

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Which bacteria cause Lyme disease?

a. Streptococcus pyogenes b. Staphylococcus aureus c. Escherichia coli d. Borrellia burgdorferi e. Bordetella recurrentis

Biology & Microbiology

When considering the initiation of transcription, one often finds consensus sequences located in the region of the DNA where RNA polymerase(s) binds. Which of the following is a common consensus sequence?

A) TTTTAAAA B) satellite DNAs C) TATA D) any trinucleotide repeat E) GGTTC

Biology & Microbiology

Nondisjunction in humans can result in 

A. 22 pairs of autosomes, an X chromosome and a Y chromosome. B. 22 pairs of autosomes, and two X chromosomes. C. 47 chromosomes. D. 46 chromosomes.

Biology & Microbiology

What is typical osmolarity of body fluids in most freshwater invertebrates?

a. about 225 mOsm/L b. about 300 mOsm/L c. about 1000 mOsm/L d. about 1500 mOsm/L

Biology & Microbiology