Which of the following hormones is produced only
when a woman is pregnant?
a. testosterone
b. gonadotropic-releasing hormone
c. human chorionic gonadotropin
d. estrogen
e. progesterone
Answer: c
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Which of the following represents a long-distance signaling mechanism?
A. contact-to-contact signaling B. intercellular signaling C. autocrine signaling D. paracrine signaling E. endocrine signaling
In snapdragons, heterozygous plants have pink flowers, one of the homozygous conditions produces red flowers, and the other homozygous condition produces white flowers. When a parent plant with red flowers is crossed with a parent plant with white flowers, what percentage of the F1 offspring are expected to have pink flowers?
a) 75% b) 25% c) 0% d) 100% e) 50%
Which of the following is correct about the evolutionary relationships among the three domains?
A. Archaea and bacteria are more closely related to each other than to eukaryotes. B. Archaea and eukaryotes are more closely related to each other than to bacteria. C. Eukaryotes and bacteria are more closely related to each other than to archaea. D. They are equally distant from each other.
Enzymes that are secreted out of the cell to aid in the acquisition and digestion of environmental nutrients are called ________.
Fill in the blank(s) with the appropriate word(s).