In the bonding of nitrogenous bases
a. adenine is paired with cytosine.
b. adenine is paired with guanine.
c. cytosine is paired with thymine.
d. guanine is paired with cytosine.
e. cytosine is paired with uracil.
D
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In the accompanying figure, the structure responsible for photosynthesis, storage, and support is labeled as:
a. 1
b. 2
c. 3
d. 4
e. 5
__________ occurs when two species act as agents of selection upon one another.
Fill in the blank(s) with the appropriate word(s).
In a showy flower such as a magnolia or rose, the flower parts that play the main role in attracting the notice of animal pollinators are the
A) petals. B) sepals. C) fruits. D) stigmas.
Select the correct statement.
A) in humans, meiosis of diploid cells in the ovaries produces haploid female gametes, or eggs B) in humans, mitosis of haploid cells in the testes produces haploid gametes, or sperm C) in plants, diploid cells in the anther undergo meiosis to produce eggs D) in plants, diploid cells in the ovule undergo meiosis to produce diploid gametes E) none of the choices is correct