A cell that is 98% water is placed in pure water. This cell will
A. shrink.
B. swell.
C. shrink and then swell.
D. remain the same size.
B. swell.
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Which of the following statements about pinecones
is true? a. Cones are exclusively female structures. b. Cones are the result of pollination. c. One type of cone produces microspores. d. Pollen grains are retained within male cones. e. Microspores develop into female gametophytes within the ovule.
It has been difficult to generate drugs to treat AIDS for which reason?
A. HIV does not cause AIDS. B. HIV does not use any enzymes that can be targeted by drugs. C. HIV mutates rapidly. D. The only way to kill a virus is with a vaccine, not with drugs. E. People with HIV infections die rapidly, before the drugs have a chance to cure them.
The sub-atomic particle with a positive charge is ________.
A. a proton B. a neutron C. an ion D. an isotope E. an electron
________ hormone stimulates the male gonads to produce testosterone and triggers ovulation in females.
A. Growth B. Follicle-stimulating C. Adrenocorticotropic D. Luteinizing