Which of the following best describes the ploidy level of the cells found in the embryo sac after fertilization?
A. There are haploid, diploid, and triploid cells.
B. All cells are polyploid.
C. All cells are triploid.
D. All cells are diploid.
E. The ploidy level varies among species.
Answer: A. There are haploid, diploid, and triploid cells.
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Which is not an example of a induced mutational mechanism?
A. DNA replication errors B. Tautomeric shifts of nucleic acid bases C. Aberrant recombination D. UV light E. Transposable elements
Exhalation is a passive process unless we must forcibly exhale
a. true b. false
Complex societies involving a caste system, where individuals are born into a specific role, can be found among which of the following?
A) Amphibians B) Birds C) Reptiles D) Fishes E) Insects