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【单选题】
At the isoelectric pH of a tetrapeptide:A.
only the amino and carboxyl termini contribute charge.
B.
the amino and carboxyl termini are not charged.
C.
the total net charge is zero.
D.
there are four ionic charges.
E.
two internal amino acids of the tetrapeptide cannot have ionizable R groups.
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【单选题】The ________ cause of his illness was excessive drinking, but the real cause was his deep grief at his wife's death. [ ]
A.
apparent
B.
obvious
C.
clear
D.
distinct
【单选题】The medicine ______ his pain but did not cure his illness.
A.
activated
B.
alleviated
C.
mediated
D.
deteriorated
【单选题】Li Xing’s illness(病) is very_____. You must take his illness ______.
A.
serious, seriously
B.
serious, serious
C.
seriously, seriously
D.
seriously, serious
【简答题】We are sure that he will get over his illness.
【单选题】As there is no indication the danger of his illness has passed, his family have to get ready for ______ the worst.
A.
that
B.
which
C.
because
D.
if
【单选题】From this passage, it can be known that Hawking ______.
A.
is unhappy because of his illness
B.
is always complaining about his illness
C.
is fearless in face of his illness
D.
is interested in science because of his illness
【简答题】We are certain that he will get over his illness.
【单选题】The professor persisted in attending the conference ______ his illness and the heavy storm.
A.
given
B.
despite
C.
in spite
D.
although
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