The Hayflick limit describes ____
A. the size limit to which a cell can grow
B. the number of divisions a cultured cell can undergo
C. the largest number of chromosomes an organism can possess
D. the most cells an organism can have
E. how rapidly DNA replication occurs
B
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An attenuated strain of a pathogen
A) has lost its virulence, but may be used to create a vaccine. B) has changed its antigens to avoid an adaptive immune response. C) is more virulent than the regular strains and may cause septic shock. D) is an extracellular pathogen that will be cleared by innate immunity.
Sexual reproduction produces genetically unique individuals through (select all correct choices):
A. recombination during gamete formation. B. independent assortment during gamete formation. C. mutation during gamete formation. D. the combination of genetically unique gametes to form a new individual. E. DNA transfer during conjugation.
The most prominent tissue in the stems of herbaceous plants is
a. epidermis. b. parenchyma. c. phloem. d. xylem.
The major bonds in glycogen are _______ glycosidic bonds.
a. alpha 1?4 b. alpha 1?6 c. beta 1?4 d. beta 1?6