Sickle-cell anemia results from a beta-globin protein containing the amino acid valine in the place of the amino acid glutamic acid. This is an example of a ________ causing a disease.
A) microbiome
B) gene pool
C) multifactorial trait
D) mutation
D) mutation
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What is the first step in the germination of a seed?
A) pollination B) fertilization C) imbibition D) hydrolysis of starch and other food reserves E) emergence of the radicle
On a field trip, you observe red, tubular flowers along the trail. You will expect them to be pollinated by
A. bees. B. hummingbirds. C. moths. D. beetles. E. bats.
By the eighth week in humans
a. the embryo looks distinctly human. b. the neural tube is complete. c. upper and lower limbs have formed, and individual fingers and toes have separated from each other. d. male or female reproductive structures are forming. e. all of these are true.
Members of which of the following genera are the most common sexually transmitted bacteria in the United States?
A) Bacteroides B) Rickettsia C) Chlamydia D) Helicobacter E) Treponema