The complex polysaccharide that provides flexibility to the primary walls of collenchyma cells is called ____
a. cellulose
b. lignin
c. fiber
d. pectin
e. cuticle
ANSWER: d
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Groups of sites within an area that are at different stages of succession are known as
A) autosequences. B) ecotypes. C) clines. D) chronosequences.
Which action is LEAST likely to reduce cancer risk?
a. restricting alcohol intake b. beginning estrogen replacement therapy after menopause c. maintaining a desirable weight d. avoiding tobacco e. avoiding direct sun exposure
____ is NOT a product of the Kreb cycle.
A. Pyruvic acid B. ATP C. NADH2 and FADH2 D. CO2
What pattern of cleavage is characteristic of mammals?
A. Holoblastic cleavage with eggs containing very little yolk, but with the inner cell mass distributed uniformly B. Some yolk, and cleavage resulting in vegetal and animal poles C. Holoblastic cleavage with eggs containing little or no yolk D. Holoblastic cleavage with eggs containing very little yolk, but with the inner cell mass concentrated at one pole E. Meroblastic cleavage with eggs containing almost entirely yolk