Describe the theory that attempts to explain the species specificity of viruses to their hosts. What will be an ideal response?
Concepts to Consider: Viruses may have come about by escaping from cellular organisms such as
bacteria, plants, and animals. It may be that viruses can only infect organisms from which they
originated. This could explain why viruses are very specialized concerning their hosts.
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In the photosystem I reaction center, light energy captured by pigment molecules is passed to a special reaction center chlorophyll a called
A. P680. B. P700. C. chlorophyll I. D. chlorophyll II. E. retinal.
Answer the following statements true (T) or false (F)
1. G proteins and Ras are activated when bound to guanosine diphosphate. 2. One common feature with G-protein coupled, enzyme-linked, and growth factor receptors is that their activation leads to activation of protein kinases. 3. Cyclic AMP activates protein kinase C in producing a cell response. 4. If IP3 binds a Ca2+ ligand-gated ion channel in the endoplasmic reticulum then cytosolic Ca2+ levels will rise in the cell.
The first stable compound produced from CO2
in the light-independent reaction is a. phosphoglycerate (PGA). b. ribulose bisphosphate (RuBP). c. phosphoglyceraldehyde (PGAL). d. O2. e. NADP+.
A certain species of land snail exists as either a cream color or a solid brown color. Intermediate individuals are relatively rare. Which of the following terms best describes this?
A) artificial selection B) directional selection C) stabilizing selection D) disruptive selection E) sexual selection