Presently, it is thought that organic polymers may have formed and accumulated on:
a. water and shells.
b. sand and mud.
c. silt and sand.
d. rocks and clay.
e. sand and heavy metals
D
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Cell walls are used by many different organisms for protection from their environment and structural support. These cell walls must obviously be insoluble in water; otherwise, they would dissolve the first time an organism got wet
Which of the following carbohydrates would you expect to be most soluble in water? A) starch B) peptidoglycan C) cellulose D) chitin
Cytotoxic T cells destroy cancerous cells by
A. forming the membrane attack complex. B. releasing vesicles containing perforin. C. activating natural killer cells. D. opsonization. E. secreting cytokines.
Which ion is not transported out of the cells when a person has cystic fibrosis?
a. Nitrogen b. Hydrogen c. Sodium d. Potassium e. Chloride
An abnormally high level of ketone bodies in the blood is called
What will be an ideal response?