The two basic classes of cells are:

A) human and bacteria
B) bacteria and eukaryotes
C) unicellular and multicellular
D) prokaryotes and eukaryotes
E) plant and animal


Ans: D) prokaryotes and eukaryotes

Biology & Microbiology

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According to most paleoanthropologists, which of the following is true?

a. When modern humans arose, archaic humans disappeared worldwide. b. Modern humans and archaic humans survived side-by-side for millions of years in Africa. c. When modern humans arose, archaic humans disappeared in Africa. d. Modern humans and archaic humans survived side-by-side for thousands of years in Africa.

Biology & Microbiology

If a portion of the pancreas is surgically removed from a rat and the rat subsequently loses its appetite, one explanation is that the removed portion contains cells that secrete a chemical signal that somehow stimulates appetite

Given this scenario, what type of chemical signaling is occurring? A) autocrine B) paracrine C) endocrine D) neuroendocrine

Biology & Microbiology

Which of the following is likely to have the lowest concentration of O2?

A) warm salt water B) cool salt water C) cool fresh water D) warm fresh water

Biology & Microbiology

Which solute must be administered in high amounts because of its very efficient secretion and removal by the kidney tubules?

A. Penicillin B. Amino acids C. Vitamin K D. Glucose E. HCO3- ions

Biology & Microbiology