Nitrogen is a major bioelement that can be found in:
a. proteins
b. Nucleic acids
c. Polysaccharides
d. Lipids
A. A and B
B. A, B and C
C. B and C
D. A, B, C, and D
Ans: A. A and B
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Some members of the Thermoplasmatales can grow at pH levels below
A) 4. B) 7. C) 0. D) 10.
_____ trigger fusion of synaptic vesicles with the synaptic membranes of the presynaptic cell. The same stimulus also triggers ____
a) acetylcholine, endocytosis b) Na+ ions, exocytosis c) Ca2+ ions, endocytosis d) Cat2+ ions, exocytosis e) Acetylcholine, exocytosis
How does the sperm of an angiosperm reach the egg?
A) via the pollen tube that grows from the pollen grain through the carpel tissues to the ovule B) via the pollen tube that grows from the ovule to reach the pollen grain on the stigma C) usually via an insect, which places sperm in the ovary while probing for nectar D) by actively swimming down through the style to the egg
Why is it more likely that coincidental homologies (i.e., similarities that are just by chance) are statistically more likely to occur with DNA than protein comparisons between species?
What will be an ideal response?