Fertilization of plant gametes directly produces

a. a zygote.
b. a gametophyte.
c. a spore.
d. either a sperm cell or egg cell.
e. a sporophyte


A

Biology & Microbiology

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When a membrane is said to be selectively permeable, this means that _____

A. half of the membrane is permeable, and the other half is not B. only water can pass through it C. the membrane regulates movement of substances into and out of the cell D. the membrane is permeable only part of the time

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The ____ meristems are the source of new cells that allow plants to grow in diameter

Fill in the blank with the appropriate word.

Biology & Microbiology

submucosa

What will be an ideal response?

Biology & Microbiology

The pathogenicity of primary tuberculosis is due to the fact that the mycobacteria

A) are not phagocytized. B) prevent fusion of lysosomes with vesicles. C) form a pseudomembrane. D) destroy helper T cells. E) are carried by macrophages to a variety of sites.

Biology & Microbiology