Chlamydias and rickettsias are unusual bacteria because they do not have cell walls.
Answer the following statement true (T) or false (F)
False
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The most common outcome of the process in the accompanying figure is no viable gametes. This happens because of:
a. hybrid inviability.
b. defective meiosis.
c. gametic isolation.
d. species incompatibility.
e. a low rate of fertilization.
Which of the following statements about enzymes is not true?
A. Enzymes are catalysts. B. Almost all enzymes are proteins. C. Enzymes operate most efficiently at optimum pH. D. Enzymes are destroyed during chemical reactions.
A food web is generally simpler to visualize than a food chain.
Answer the following statement true (T) or false (F)
Oxygen-poor blood is carried from the heart of a mammal to the lungs via the
A) pulmonary arteries. B) pulmonary veins. C) superior vena cava. D) inferior vena cava.