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

Biology & Microbiology

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________-driven promoters do not contain TATA boxes or BREs.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

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

Biology & Microbiology

Discuss two hypotheses that attempt to explain the high species richness in the tropics

What will be an ideal response?

Biology & Microbiology

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

Biology & Microbiology