Birds and mammals have a more active lifestyle than reptiles due to
A) insulation over their body surface.
B) internal fertilization.
C) a slower metabolism.
D) internal fertilization and a high, constant body temperature.
E) a high, constant body temperature and insulation over their body surface.
E
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Once species have formed, they keep their identity by
A. developmental differences. B. genetic blocks. C. isolating mechanisms. D. somatic mutations. E. structural modifications.
A centromere is least likely to ____
a. divide in anaphase of mitosis b. connect sister chromatids c. attach chromosomes to spindle fibers d. cross over during prophase I of meiosis e. be a component of DNA
What is the purpose of the sex pilus?
a. to form a gap junction and conjugate b. to allow transfer of gametes c. to facilitate DNA exchange d. to stabilize a network of bacterial cells
Female salmon build nests in gravel river bottoms to lay eggs, which are then fertilized by male salmon that approach and deposit their sperm over the eggs. This is an example of
A) copulation. B) internal fertilization. C) parthenogenesis. D) spawning. E) hermaphrodism.