____ may have been the ancestors of cellular life
a. Circular RNA
b. Prokaryotic cells
c. Pseudocells
d. Lipid globules
e. Protocells
ANSWER: e
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The width of a DNA double helix
a. is constant. b. is narrower where adenine is present than where cytosine is present. c. is wider where purines are present than where pyrimidines are present. d. varies randomly. e. is wider where pyrimidines are present than where purines are present.
What is the name of the area where bones meet and interact?
a. joint b. ligament c. osteoblast d. bony matrix e. connective tissue
Glucose-6-phosphate dehydrogenase (G6PD) deficiency is inherited as an X-linked recessive gene in humans. A woman whose father suffered from G6PD marries a normal man. What percentage of their sons is expected to be G6PD?
A) 50% B) 25% C) 100% D) 0% E) 75%
When electrons are removed from nutrients via an oxidation reaction, the coupled reduction reaction may be
A) NAD+ ? NADH. B) NADH ? NAD+. C) FAD ? FADH2. D) either FAD ? FADH2 or NAD+ ? NADH. E) either NAD+ ? NADH or NADH ? NAD+.