Tissue-building steroids are known as
a. catabolic.
b. metabolic.
c. anabolic.
d. actinic.
e. nicotinic.
C
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Photosynthesis spread through most of the eukaryotic superkingdoms by repeated episodes of endosymbiosis of photosynthetic eukaryotic organisms
A. true B. false
Bacterial cells are placed into a 250mL liquid growth medium in a closed laboratory flask. According to Malthusian theory, they will reproduce exponentially and then:
A. continue reproducing arithmetically as long as there are no limitations on food supply. B. continue reproducing geometrically as long as there are no limitations on food supply. C. continue reproducing arithmetically until the food supply is used up, then they will cease to grow. D. continue reproducing geometrically until the food supply is used up, then they will cease to grow.
The zygotes of modern charophytes and reproductive spores in land plants are protected from desiccation by ____
a. stomata b. chlorophyll c. a cuticle d. starch e. sporopollenin
In __________, one of the sperm cells in the pollen tube fertilizes the egg, forming a diploid zygote; the other fuses with the central cell, forming a triploid cell.
Fill in the blank(s) with the appropriate word(s).