The use of the Gram stain in microbiology is important because it differentiates
A) Bacteria from Archaea.
B) prokaryotic from eukaryotic cells.
C) bacterial cells with different types of cell walls.
D) archaeal cells with different types of metabolism.
Answer: C
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All EXCEPT which of the following
statements about Neanderthals is true? a. Neanderthals diverged from modern humans around 500,000 years ago. b. They lived in Europe and the Near East. c. Neanderthals are direct ancestors of Homo sapiens. d. Neanderthals brains were larger than those of modern humans. e. They have no modern descendents.
All of the following are true of the process of
phosphorylation EXCEPT that a. a molecule gains a phosphate group. b. a molecule loses a phosphate group. c. molecules become less stable. d. it is used to prime molecules to react. e. it produces ADP from ATP.
The hormone produced by the kidney that is responsible for stimulation of the production of red blood
cells is a. erythropoietin. b. angiotensin. c. renin. d. aldosterone. e. cortisol.
Which of the following is one way in which the environment may play a role in development?
a. The environment changes the segments in which Hox genes are expressed. b. The presence or absence of neural crest cells in different species is environmentally deter-mined. c. The environment directly induces gene duplications d. Environmental conditions may change the timing of developmental changes.