Which of the following elements is correctly matched with its major function in plants?
a. phosphorus?alters membrane permeability
b. sulfur?essential part of chlorophyll
c. potassium?opens and closes stomata
d. carbon?maintains turgidity of cells
e. calcium?involved in nitrogen-fixation
C
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Which biochemical pathway fits the data presented?
Assume that a series of compounds has been discovered in Neurospora. Compounds A–F appear to be intermediates in a biochemical pathway. Conversion of one intermediate to the next is controlled by enzymes that are encoded by genes. Several mutations in these genes have been identified and Neurospora strains 1–4 each contain a single mutation. Strains 1-4 are grown on minimal media supplemented with one of the compounds A-F. The ability of each strain to grow when supplemented with different compounds is shown in the table (+ = growth; o = no growth).
media supplement
A) A ? B ? C ? D ? E ? F
B) A ? B ? C ? F ? D ? E
C) F ? B ? C ? D ? A ? E
D) A ? B ? C ? D ? F ? E
E) A ? B ? F ? E ? C ? D
Are humans responsible for neurotoxic shellfish poisoning? What will be an ideal response?
Connective tissue contains three types of fibers: collagen, elastic, and cartilage. Indicate whether the statement is true or false
Which of the following diseases is NOT a streptococcal disease?
A) Rheumatic fever. B) Whooping cough. C) Scarlet fever. D) Strep throat. E) Necrotizing fasciitis.