A biology student takes fish, algae, pond plants, invertebrates, and bottom sediment from a local pond and establishes them in an aquarium. When the system is stable, the student seals it into a large, airtight glass box and leaves the box in a sunny
location. After 3 months, the organisms in the aquarium appear alive and healthy. Which statement about the experiment is true?
A) No energy has entered or left the glass box during the 3 months.
B) Some of the energy in the system has moved from one organism to another during the 3 months.
C) The air in the glass box contains no carbon dioxide.
D) During the 3 months, the biomass of animal life was greater than the biomass of plant life.
Answer: B
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A woman who is heterozygous for an allele that results in X-linked pattern baldness marries a man who is nonbald. Which of the following would be true of their offspring?
A. All would be bald B. All of the females would be nonbald, all males would be bald C. All of the females would be nonbald, ½ of the males would be bald D. ½ of females would be bald, and ½ of the males would be bald E. All would be nonbald
Which is easier to establish in a pure-breeding population, a dominant or a recessive gene? What will be an ideal response?
Which of the following is not a heavy metal?
A. Zinc B. Merthiolate C. Tincture of iodine D. Silver nitrate solution E. Mercurochrome
Which of the statements below are true for chromosomes in eukaryotic cells?
What will be an ideal response?