In flowering plants, one sperm nucleus fuses with an
egg nucleus, and a zygote forms that develops into an
embryo. Another sperm nucleus
a. fuses with a primary endosperm cell to produce
three cells, each with one nucleus.
b. fuses with a primary endosperm cell to produce
one cell with one diploid nucleus.
c. fuses with the endosperm mother cell, forming a
primary endosperm cell with a single triploid
nucleus.
d. fuses with one of the endosperm mother cell
nuclei to produce a diploid tissue that serves as
the food supply for the embryo.
e. degenerates.
Answer: c
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The anterioposterior axis of an embryo is established by
A. activin. B. Hox genes. C. cadherins. D. noggin. E. transforming growth factor.
How are heterokonts characterized?
a. by having two types of nuclei b. by having two different flagella c. by having cell walls of silica d. by having cells walls of chitin
The term "ecological succession" refers to
A. the flow of energy from producers to consumers. B. replacement of one plant community by another. C. successive seasons of the year that guide the growth of ecosystems. D. an unending series of geological events that occur in all areas.
Cells save energy and materials by using many of the same enzymes for both ________ and ________ .
A. peptidoglycan; lipopolysaccharides B. metabolism; catabolism C. ATP; NADPH D. anabolism; catabolism