Sucrose is composed of ____
a. two molecules of fructose
b. two molecules of glucose
c. a molecule of fructose and a molecule of glucose
d. a molecule of fructose and a molecule of galactose
e. two molecules of galactose
ANSWER: c
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Marc Spehr and his colleagues demonstrated that ____
a. sperm cannot detect and swim toward attractant molecules b. sperm can detect and swim toward attractant molecules c. eggs release chemicals that attract sperm d. sperm attraction can be inhibited by chemicals e. sperm can release chemicals that kill other sperm
Which of the following contributed to the growth in human population that began about 11,000 years ago?
a. sidestepping limiting factors b. increased carrying capacity c. all of the choices d. geographic expansion
The bacteriophages used in Alfred Hershey's and Martha Chase's experiments showed that:a
DNA was injected into bacteria. b. DNA and protein were injected into bacteria. c. DNA remained on the outer coat of bacteria. d. proteins were injected into bacteria. e. proteins were responsible for the production of new viruses within the bacteria.
Which of the following animals displays radial symmetry?
A) an earthworm B) a sea anemone C) a fish D) a lobster