Which statement describes viruses?
A) Viruses are living cells that can invade other organisms.
B) Viruses use energy to perform life functions.
C) Viruses use host cells to make more viruses.
D) Viruses will die unless they are inside an organism.
C
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Which of the following is NOT produced by the gonads?
a. testosterone b. progesterone c. follicle-stimulating hormone d. androgens e. inhibin.
Eugenics ____
a. has been scientifically tested and shown to be a valid theory b. is a dubious method for improving the human species through selective breeding c. assumes that human traits are much more influenced by environment than by genes d. had major social ramifications in Germany but is largely dismissed in the United States e. was based on faulty karyotyping and DNA analysis
When cultured normal human cells were infected with a virus that carried the genes that coded for a
subunit of telomerase:a. the cells underwent more cell divisions than normal. b. the cells underwent fewer cell divisions than normal. c. the cells died almost immediately. d. the cells underwent gene expression more vigorously. e. the cell cycle shortened.
Amongst the chordates, which features are unique to the tunicates?
A. sexual reproduction and complete digestive system B. leathery outer covering and sessile adult stage C. sessile adult stage and aquatic lifestyle D. gill slits and bilateral symmetry E. leathery outer covering and an excurrent siphon