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
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Which bacteria cause Lyme disease?
a. Streptococcus pyogenes b. Staphylococcus aureus c. Escherichia coli d. Borrellia burgdorferi e. Bordetella recurrentis
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
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.
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