Which of the following statements is true?
a. When lipids and water are mixed, it is the water
molecules that isolate themselves into droplets.
b. When lipids and water are mixed, the lipids
dissolve and enter into a solution.
c. Lipids are nonpolar and will not dissolve in
water.
d. Polar substances are able to pass through a
plasma membrane more readily than nonpolar
substances.
e. All portions of a phospholipid molecule found in
a membrane are classified as nonpolar.
Answer: d
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The endomembrane system did not start developing until the atmosphere was ____
a. high in oxygen, high in carbon dioxide b. high in hydrogen, low in oxygen c. changing from low oxygen to high oxygen levels d. firmly in the age of aerobes e. low in hydrogen, low in oxygen
What is an adaptation (in the context of evolutionary theory)?
What will be an ideal response?
Vertical evolution arises from
A. genetic mutations. B. gene duplication. C. exon shuffling. D. genetic mutations and gene duplication. E. genetic mutations, gene duplication and exon shuffling.
Functionally important gene sequences such as those encoding ribosomal RNA are
A. highly repetitive sequences. B. minimally repetitive sequences. C. moderately repetitive sequences. D. transposable sequences. E. highly mutated sequences.