更多"Biologists have ascertained that sp"的相关试题:
[单项选择]Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.
A. determined
B. argued
C. pretended
D. hypothesized
[单项选择]Biologists have {{U}}ascertained{{/U}} that specialized cells convert Chemical energy into mechanical energy.
A. determined
B. argued
C. pretended
D. hypothesized
[单项选择]Plant guard cells(保卫细胞) have a higher [C1-] than the outside
environment. The most likely explanation for this is( ).
A. Water leaves the cell by osmosis.
B. C1- is diffusing through transmembrane channels.
C. C1- diffusion is aided by a mobile carrier.
D. An active transport symport transports C1-/H+.
E. None of the above
[单项选择]Many evolutionary biologists believe that
A. emotions do not exist.
B. emotions contribute to survival.
C. emotions serve no other purpose than giving meaning and depth to life.
D. only humans are capable of emotions.
[单项选择]Biologists report that the biodiversity is decreasing because ______.
A. more individual households are increasing greatly
B. human beings are threatening many wild creatures
C. human populations have been decreasing in recent years
D. wild creatures depend on more individual households
[单项选择]The police ascertained that there were no signs that the fire had been set ______.
A. virtually
B. occasionally
C. incidentally
D. deliberately
[单项选择]The author thinks that the biologists who engineer genes into plants ______ .
A. are nothing more than any other substances because they are made of molecule too
B. pay special attention to living things and their relation to their environment
C. insert the genes of one species among the genes of another and test the environment consequences
D. modify the genes of our food crops without considering the influence on the whole organism
[单项选择]The jobs of wildlife technicians and biologists seemed ______to him ,but one day he discovered their difference.
A. identical
B. vertical
C. parallel
D. specific
[单项选择]According to some biologists, the instinct to care for the young is perhaps the most interesting characteristic of animals.
A. actually
B. surprisingly
C. seldom
D. possibly
[单项选择]According to biologists, animal populations at a given time are _________ by food supplies at that time.
A. governed
B. sustained
C. mediated
D. manipulated
