How do identical twins develop?
a. When two eggs are fertilized by the same sperm
b. When two sperm fertilize the same egg
c. When a fertilized ovum divides to give two identical fertilized ova
d. When two different sperm fertilize two different ova
e. When a single sperm fertilizes two different ova
c. When a fertilized ovum divides to give two identical fertilized ova
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"Most people do not approve of excessive public displays of affection." This is an example of a(n) ____
a. injunctive norm b. descriptive norm c. standard d. personal norm
To equalize the intelligence of members of the experimental and control group in an experiment, you could use
a. extraneous control. b. random assignment. c. independent control. d. subject replication.
Which of the following individuals is the most likely to have ongoing symptoms of traumatic brain injury?
a. Guillaume, who is an Olympic sprinter b. George, who has been a professional American football player for many years c. Michael, who has been an Olympic swimmer for years d. Samuel, who has been a professional ballet dancer for years
An endogenous opioid is an example of a(n)
a. neurotransmitter. b. peptide neuromodulator. c. brain hormone. d. ion e. monoamine.