Active transport makes it possible for cells to:
a. take up nutrients from the environment against concentrations gradients.
b. transport out secretory products and waste material against concentration gradients.
c. maintain nonequilibrium intracellular concentrations of ions such as Na+, K+, Ca2+, and H+.
d. establish an electrical potential across the membrane.
e. All of the above are correct.
e. All of the above are correct.
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What will be an ideal response?
If the syringe contains live R strain and heat-killed S
strain Streptococcus pneumoniae a. the mouse will live. b. live S strain bacteria will be detected in the mouse’s blood. c. the mouse’s blood will contain live pathogenic R strain bacteria. d. The dead S strain bacteria will transform to live R strain bacteria. e. DNA from the live R strain bacteria will revive the dead S strain bacteria.
Which of the following supplies the greatest percentage of total energy for mankind?
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