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Exam 1

Terms in this set (20)

What are nitrogenous bases of the purine type
Guanine and adenine
a covalent chemical bond is one in which
outer shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms
a group of molecular biologists is trying to synthesize a new artificial compound to mimic the effects of a known hormone that influences sexual behavior. What compound is most likely to mimic the effects of the hormone
a compound with the same three-dimensional shape as part of the hormone
nitrogen is much more electronegative than hydrogen. what is correct about the atoms in ammonia
each hydrogen atom has a partial positive charge; the nitrogen atom has a partial negative charge
which modifications of fatty acids will best keep triglycerides solid at warmer temperatures
adding hydrogens to the fatty acids
knowing just the atomic mass of an element allow inferences about which of the following
the number of protons plus neutrons in the element
which bond or interaction would be difficult to disrupt when compounds are put into water
covalent bond
at which level of protein structure are interactions between the side chains most important
tertiary
if a DNA sample are were composed of 10% thymine, what would be the percentage of guanine
40
what statement is true about buffer solutions
the maintain a relatively constant pH when either acids or bases are added to them
write the chemical reaction for bicarbonate ion and hydrogen ion
H2CO3 <=> HCO3(-) + H(+)
if the pH of the blood increases, one would expect
a decrease in the concentration of H2CO3 and an increase in the concentration of HCO3(-)
many mammals control their body temperature by sweating. which property of water is most directly responsible for the ability of sweat to lower body temperature
the absorption of heat by the breaking of hydrogen bonds
about 25 of 92 natural elements are known to be essential to life. which four of these 25 elements make up approximately 96% of living matter
carbon, hydrogen, nitrogen, oxygen
the atomic number of neon is 10. therefore, what is correct about an atom of neon
it has 8 electrons in its outer electron shell and is inert
which of the following explains most specifically to attraction of water molecules to one another
hydrogen bonds between water molecules
the molecular formula for glucose if C6H12O6. what would be the molecular formula for a molecule made by linking three glucose molecules together by dehydration reactions
C18H32O16
research indicates that ibuprofen, a drug used to relieve inflammation and pain, is a mixture of two enantiomers; that is, molecules that
are mirror images of one another
what are some polymers
DNA, starch, chitin, cellulose
what maintains the secondary structure of a protein
hydrogen bonds between the amino group and carboxyl group within a single polypeptide chain
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