Poikilothermic organisms have body temperatures that ____.
A. remain relatively constant no matter the change in the external environment
B. are the same as the temperatures of their environments
C. are nearly constant, although the brain temperature varies
D. allow them to survive in very warm climates only
Answer: B
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When female bodybuilders take steroids, they often find themselves ____
a. having developmental problems c. growing less body hair b. becoming less aggressive d. losing breast tissue
The SRY gene is expressed at about gestational week_________.
A. 6 B. 10 C. 12 D. 16
In order to select a stratified random sample, a researcher would have to know_____
a. the characteristics of individuals in the population and the relative frequency of those characteristics b. the names of all the people in the population c. the phone numbers of the people in the population d. all of these
Margot is pregnant with her first child, and she is deliriously happy! She and her husband have some tests taken, but before the doctor can come in and review the results, Jim sneaks a peak at the file with the test results
He sees that the baby has "two X chromosomes." He looks at his wife and says a. Congratulations, honey, we're having a boy! b. Congratulations, honey, it looks like we are having twins! c. Congratulations, honey, I need to take a biology class! d. Congratulations, honey, we're having a girl!