Capsules are particularly important for
A) making bacteria more vulnerable to host defense mechanisms.
B) making bacteria less pathogenic.
C) protecting bacteria from host defense mechanisms.
D) allowing bacteria to become more phagocytic.
Answer: C
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In myelinated axons, ions can diffuse the axon only at nodes of Ranvier.
A. potassium; into B. sodium; into C. sodium; out of D. potassium; out of E. All of the answer choices are correct.
Which one of the following is TRUE regarding active transport?
A) Active transport requires the input of energy. B) Molecules are moved across a plasma membrane from an area of higher concentration to an area of lower concentration. C) Active transport relies on the process of diffusion. D) Molecules to be transported attach to phospholipids in the plasma membrane; as the phospholipids change shape, the molecules are moved across the membrane. E) This mechanism allows a cell to equalize the concentration of molecules on either side of the plasma membrane.
Describe the ongoing research concerning the relationship between species richness and community
stability. What research supports or fails to support this relationship? What will be an ideal response?
In the Ames test, what happens when his- bacteria are exposed to a chemical and experience a higher level of growth than the control?
A) The his- bacteria now utilized histidine from the media. B) The reversion rate is lower than seen for spontaneous mutations. C) The his- bacteria utilized DNA repair tools to fix the mutation. D) A reversion mutation allowed the his- bacteria to regain their ability to make histidine (revert to his+). E) The tested chemical is regarded as a non-mutagen.