Sieve tubes are different from vessel members in that they:
a. carry water, not food
b. are not connected to each other
c. are alive
d. do not require companion cells
e. have pits in their walls
c
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________-driven promoters do not contain TATA boxes or BREs.
Fill in the blank(s) with the appropriate word(s).
Assume that in guinea pigs, dark brown fur (B) is dominant to black fur (b). If you mate a black guinea pig with a homozygous brown guinea pig, what proportion of the progeny will be homozygous?
A) none B) 1/4 C) 1/2 D) 3/4 E) all
The fluid mosaic model explains the function and components of which of the following?
a. Plasma membrane b. Endoplasmic reticulum c. Cytoskeleton d. Endomembrane system
Discuss two hypotheses that attempt to explain the high species richness in the tropics
What will be an ideal response?