Which of the following statements is false?
a. Veins lack smooth muscle and elastic fibers.
b. Parasympathetic nervous system stimulation
decreases heart rate.
c. Adjustments to blood flow result from stimuli
from the nervous and endocrine systems and
from changes in local chemicals.
d. Thrombin is an enzyme that acts on fibrinogen.
e. Hemostasis stops bleeding.
Answer: a
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In what part of the life cycle does DNA
replication occur?
a. G1 b. G2 c. S d. prophase e. more than one of these
Which of the following statements is true about scientific theories?
1.A theory is a related set of hypotheses that form a broad-ranging explanation of many phenomena. 2.Theories can not be rejected. 3.Once established, theories can not change. 4.Scientists must not change their minds and replace theories in light of new evidence.
What concept is used to express the growth rate of a
given population? a. doubling time b. population density c. population size d. carrying capacity e. biotic potential
The increase in life expectancy in the United States in the last 100 years is mainly due to healthier lifestyles slowing the process of ageing
Indicate whether the statement is true or false