Plants are a:
a. polyphyletic group.
b. monophyletic group.
c. group without a common ancestor.
d. group with many ancestors.
e. paraphyletic group.
B
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The membrane that surrounds the central vacuole is the ____
a. chloroplast
b. tonoplast c. chromoplast d. amyloplast e. ionoplast
The protective membranes that surround the brain and spinal cord are called the
A. peritoneum. B. meninges. C. myelin sheath. D. meconium.
Which bacterium is capable of withstanding doses of radiation that are several times higher than human cells can tolerate?
A) Staphylococcus aureus B) Saccharomyces cerevisiae C) Deinococcus radiodurans D) Escherichia coli E) Conus magus
Which method of transport is responsible for low concentrations of sodium and high concentrations of potassium within the cells of the body?
a. simple diffusion b. facilitated diffusion c. vesicular transport d. active transport