Some bacteria stain Gram-positive and others stain Gram-negative because of differences in the structure of their:

A) capsule.
B) cell membrane.
C) cell wall.
D) ribosomes.


C) cell wall.

Biology & Microbiology

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Which event will help move elements into, out of and between environmental reservoirs? a. Earthquakes b. Erosion c. All of these choices

d. Volcanic eruptions e. Uplifting

Biology & Microbiology

Scorpion respiration rates reach their maximum

a. before stimulation. b. during stimulation. c. after stimulation.

Biology & Microbiology

Avery et al. (1944 ) determined that DNA is the genetic material in T2 bacteriophage

Indicate whether the statement is true or false

Biology & Microbiology

Seven species extinctions (indicated by horizontal bars) completely eliminate three deep branching clades such as in Figure A below

What is the likely impact of such extinctions on the diversity of physiological traits when compared to a case when the same number of extinctions is spread evenly across different clades (Figure B)? a. It affects the same number of species, therefore the effect on physiological diversity is the same. b. Physiological diversity is always greater within than between clades. The extinctions in Figure B will cause a greater loss of physiological diversity. c. Deep branching points correspond to greater evolutionary differentiation. This is also the case for physiological traits. The extinctions in Figure A will have the greater effect. d. All of the above are equally likely.

Biology & Microbiology