Unexpected phenotypes can be the result of
a. altered metabolic pathways.
b. a gene mutating in different ways in different
individuals.
c. an environmental effect during development.
d. a post-developmental environmental effect.
e. any of these.
Answer: e
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Which of the following statements best describes the differences between snakes and lizards?
A. All snakes lack eyelids and all lizards have eyelids. B. All snakes lack external ear openings and all lizards have external ear openings. C. Some snakes are venomous and no lizards are. D. All snakes lack limbs but all lizards have limbs. E. None of the other choices are foolproof and combinations of characteristics are sometimes necessary to distinguish lizards and snakes.
Bicarbonate ions in the blood can absorb hydrogen ions, keeping pH balanced. Bicarbonate is acting as a ____ in blood.
A. acid B. alkaline C. buffer D. base
A cow with black and white patches is produced from a white bull and a black cow. This is an example of
a. incomplete dominance. b. Codominance. c. dominance/recessive trait. d. Pleiotropy.
The chemical composition of the gases surrounding the Earth has changed substantially over the past 4 billion years. One notable change was due to the emergence of photosynthetic organisms. The process of photosynthesis increased the amount of what gas in the atmosphere?
A. Water vapor (H2O). B. Hydrogen sulfide (H2SO4). C. Carbon dioxide (CO2). D. Nitrogen (N2). E. Oxygen (O2).