Girdling a tree is eventually lethal because it prevents
a. water uptake.
b. photosynthesis.
c. respiration.
d. sugar transport to roots.
e. water transport to leaves.
D
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Greater force of contraction comes when
A. more motor units are activated. B. motor units are stimulated for a longer time. C. more ATP is available. D. motor units have few muscle fibers per unit. E. sacromeres are longer.
The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered hearts (two atria, one ventricle)
Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The four-chambered hearts of birds and mammals are best described as _____. A) structural homologies B) vestiges C) homoplasies D) the result of shared ancestry
Which of the following statements describes events during oogenesis?
A. The primary spermatocyte divides producing two spermatids. B. The primary oocyte divides producing four diploid cells. C. The primary oocyte divides producing two haploid cells. D. The primary oocyte divides producing four haploid cells. E. None of these events occur during oogenesis.
What results from the process of translation?
a. tRNA b. mRNA c. A polypeptide d. Ribosomes