Mammary glands are called ______________
Fill in the blank(s) with correct word
mammae
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Cumulative damage from reactive ________ is thought to be a major factor in aging
A) nitrogen B) double bonds C) isotopes D) free radicals E) helium
Compared to young adults, the elderly usually have ______ levels of circulating growth hormone and _____ levels of circulating sex hormones
A. higher, higher B. higher, lower C. lower, lower D. lower, higher
During B cell sensitization and activation, antigens enter the B cell through
A) diffusion. B) osmosis. C) endocytosis. D) protein channels. E) antigen channels.
Phospholipids are able to form bilayer membranes in aqueous environments because
a. they have hydrophobic heads and hydrophilic tails. b. they have polar heads and nonpolar tails. c. they have polar tails and nonpolar heads. d. the phospho-portion can form phosphodiester bonds between adjacent phospholipids. e. two of these.