Which of the following can cause cancer?
A. chemicals
B. viruses
C. environmental contaminants
D. UV rays
E. All of the choices can cause cancer.
Answer: E
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During the follicular phase of the ovarian cycle,
A. meiosis I is completed to form the secondary oocyte. B. progesterone is secreted from the corpus luteum. C. estradiol is secreted from the cumulus mass. D. both meiosis I and progesterone secretion from the corpus luteum occur. E. both meiosis I and estradiol secretion from the cumulus mass occur.
Upon transmission of a nerve signal to a muscle cell, ________ is released from the sarcoplasmic reticulum through a gated channel.
Fill in the blank(s) with the appropriate word(s).
If there are 500 oak trees in a forest covering 50 square kilometers, then the population density is ________
A) 5 trees per square kilometer B) 10 trees per square kilometer C) 50 trees per square kilometer D) 100 trees per square kilometer
Ethylene has the effect of causing fruits to
A. enlarge. B. elongate. C. shrink. D. ripen. E. increase in juice content.