The oldest spores from which bacteria have been successfully cultured were:
A. ten weeks old
B. ten years old
C. 7,000 years old
D. 25 million years old
E. 250 million years old
E. 250 million years old
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Approximately how many genes comprise the human exome?
A) 20 million B) 200,000 C) 2,000 D) 20,000
The most commonly accepted theory used to explain movement of fluid through phloem is ____
a. the cohesion-tension theory b. the pressure flow theory
c. active transport d. dialysis e. turgor pressure
Which of the following is false about polar bears and
cold stress? a. They have coarse, hollow guard hairs in their coats, allowing them to shed water quickly. b. Brown adipose tissue insulates and generates metabolic heat. c. They hibernate during the long, cold, arctic winter. d. Thick, soft underhair traps heat. e. Close bodily contact between mother and cubs helps to reduce heat loss.
As blood glucose levels fall below normal, ____
a. insulin secretion stops b. glucagon secretion increases c. the beta cells of the pancreas are stimulated d. glucose is converted to glycogen in the liver e. somatostatin levels rise