The walls of the proximal convoluted tubule (select all correct choices):
A. are composed of epithelial cells with
microvilli on their surfaces.
B. possess numerous mitochondria.
C. use facilitated diffusion to reabsorb
glucose and amino acids.
D. are where electrolytes are reabsorbed into
the blood.
E. have a brush border which increases the
surface area of the tubule.
A,B,D,E
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Which of the following is the most likely explanation for why the human brain is capable of so much more than what would be required for evolutionary fitness?
A. The additional capabilities are by-products of what was necessary for evolutionary fitness. B. The additional capabilities were necessary for survival at one time. C. A larger brain means that additional capabilities will follow. D. None of the answer options is correct.
Which of the following might be a possible
follow-up experiment? a. Repeat in a forest area totally devoid of native butterflies. b. Repeat in a wildlife sanctuary aviary after giving birds a chance to learn about yellow H. eleuchia. c. Repeat using young, inexperienced birds. d. Repeat, but count survivors for three weeks. e. Conduct all of these
The first multicellular organisms (algae) appeared about __________ billion years ago.
A. 1 B. 1.8 C. 3.5 D. 13
Diamond shaped scales on lower order fish like bowfins and sturgeons
A) ganoid B) cycloid C) ctenoid D) placoid