Unlike xylem, phloem is made up of __________
A. cells that transport solutes
B. cells that still have organelles
C. cells that run the length of the plant
B
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When the predator population is above the prey isocline, the prey population is
a. increasing b. decreasing c. neither increasing nor decreasing
Ricin is
a. a substance found in castor bean seeds. b. a polysaccharide extracted from rice. c. an ingredient in many paints and cosmetics. d. a protein that inactivates ribosomes. e. a substance found in castor bean seeds and a protein that inactivates ribosomes.
All of the following pertain to virus envelopes except they
A. are gained as a virus leaves the host cell membrane. B. are located between the capsid and nucleic acid. C. contain special virus proteins. D. help the virus particle attach to host cells. E. are found primarily on animal viruses.
Which gene therapy is currently approved in the United States?
A) stem cell gene therapy B) enhancement gene therapy C) somatic gene therapy D) germ-line gene therapy