What type of bond forms between two hydrogen molecules to form hydrogen gas?
a. Double covalent
b. Triple covalent
c. Hydrogen
d. Ionic
e. Single covalent
e
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One hypothesis on the origin of DNA points to RNA viruses evolving a modified nucleotide that is insensitive to ribonucleases
Indicate whether the statement is true or false.
The respiratory surfaces of mammalian lungs are called
a. alveoli. b. bronchi. c. tracheae. d. bronchioles. e. air sacs.
In order to gain muscle size and strength, it is necessary to
a. increase protein intake well above the RDA. b. train intensely with adequate rest periods in between. c. train every day at the highest intensity possible. d. all of these
T cells that recognize autoantigens are induced to undergo (apoptosis/proliferation/recombination) in the thymus.
Fill in the blank(s) with the appropriate word(s).