The nitrogenous base found in RNA but not DNA is ________
Fill in the blank(s) with correct word
uracil
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A host plant race may develop ____
a. only when an organism’s genes for the host choice change b. only when an organism’s genes for mating preferences change c. only when a geographical barrier exists d. when genes for the host choice mating preferences change e. when genes for mating preferences change and geographical barriers exist
Which cell does NOT have a nucleus in humans?
a. erythrocytes b. lymphocytes c. neutrophils d. eosinophils e. macrophages
Most of the nitrogen in the environment is in the form of nitrogen gas, which is the form used by most organisms
Indicate whether the statement is true or false
Which statement best describes the role of the megaspore in angiosperm reproduction?
A) The megaspore produces the egg-containing embryo sac. B) The megaspore develops into a seed. C) The megaspore develops into the anther. D) The megaspore produces pollen grains.