Whether a geographic barrier can block gene flow
depends on an organism’s
a. means of travel.
b. means of gamete dispersalspeed of travel.
c. inclination to disperse.
d. range of travel.
e. A and B are both correct.
Answer: e
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It has been thought that many diseases now associated with aging are related to malfunctioning
mitochondria. Why are the mitochondria so important to all cells?
a. They produce energy in the form of ATP. b. They generate heat to keep the body warm. c. They are the source of all human disease. d. They are extremely large. e. They are located only in vital organs.
The major lymph vessel that collects excess fluid
from most of the body is the a. thoracic duct. b. hepatic portal vessel. c. subclavian vessel. d. right lymphatic duct. e. lymphocyte duct.
Globally, cigarette smoking kills four million people
annually. That number is expected to increase to _____ million by 2030. a. 10 b. 50 c. 100 d. 150 e. 250
What would happen to an egg that had a nonfunctional chorion?
A. The embryo would die due to high levels of toxic metabolic wastes. B. The embryo would starve in the egg. C. The embryo would suffocate or dehydrate. D. The embryo would develop normally.