At what point in development do the organs begin to form?
a. immediately after fertilization
b. during cleavage
c. immediately after cleavage
d. during gastrulation
e. after gastrulation
ANSWER: e
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Movement of phloem sap from a source to a sink _____
A) occurs through the apoplast of sieve-tube elements B) depends upon active transport of sugars into the sieve-tube elements C) depends on tension, or negative pressure potential D) depends on active transport of water into sieve- tube elements at the source E) results mainly from diffusion of sugars into companion cells
In transduction, the DNA is being moved between the two cells by
A) a third bacterial cell. B) a phage. C) transposons. D) membrane bound transport proteins.
Four of the five gases listed below were components
of the first primitive atmosphere simulation experiment. Select the exception. a. CH4 b. CO2 c. H2 d. H20 e. NH3
Why do cells pump things like protons against their electrochemical gradients?
What will be an ideal response?