In a double helix, a ________ always pairs with a ________.
a. purine; pyrimidine
b. carbon; phosphate
c. purine; phosphate
d. pyrimidine; carbon
a. purine; pyrimidine
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Which scientific name for the wolf is presented correctly?
(a) Canis lupus. (b) canis lupus. (c) Canis lupus. (d) Canis Lupus.
Where does glycolysis takes place?
A. mitochondrial matrix B. mitochondrial membrane C. mitochondrial inner membrane D. mitochondrial intermembrane space E. cytosol
In the early 1900s, many people, particularly in the southern U.S., suffered from infections
with parasitic hookworms. Many of these hookworms feed on blood cells of the host and thus also consume iron that is found in red blood cells. A symptom of a heavy infection is a craving to eat dirt—particularly clay-like soils with a high iron content. Thus, for these people, iron is a __________.
a. tradeoff b. constraint c. part of the organism’s niche d. nonlimiting resource
Which of the following is a bacterial infection that can cause the uterine tubes to be blocked by scar tissue?
A) Chlamydia B) Genital herpes C) HIV D) Trichomoniasis E) HPV