The diet of the direct ancestors of primates included
a. grass and leaves.
b. insects and seeds.
c. fruits and nuts.
d. eggs and smaller animals.
e. all of these
Answer: b
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A tRNA with the anticodon sequence 5? IUC 3? will not normally exist because
A) 5? GAU 3? and 5? GAC 3? specify asparagine, but 5? GAA 3? specifies glutamic acid. B) 5? GAU 3? and 5? GAC 3? specify different amino acids. C) I is not a base present in tRNAs. D) 5? GAU 3? and 5? GAC 3? both specify asparagine.
Air in the pleural cavity is called
a. hemothorax. b. pneumothorax. c. hemopneumothorax. d. hydrothorax. e. pleurothorax.
Explain the structure and function of the cell nucleus. Include the terms nuclear envelope, nucleoli, chromatin,
chromosomes, autosomes, and sex chromosomes. What will be an ideal response?
Which of the following substances can easily diffuse across the lipid bilayer of the cell membrane? (Circle ALL that apply.)