Which of the following provides evidence that mitochondria and chloroplasts were once free-living prokaryotic organisms?
A) They contain nucleoids.
B) They contain their own DNA, independent of the nucleus.
C) They capture the energy of sunlight to make ATP.
D) They produce digestive enzymes on their rough ER.
B
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If the fluid inside of a cell has a 5% solute concentration, what would happen if the cell was placed in a solution with a 10% solute concentration?
A. Water molecules would leave the cell by osmosis. B. Water molecules would enter the cell by osmosis. C. Water molecules would cross the membrane in both directions, but there would be no net movement of water molecules. D. There would be no movement of water molecules in either direction. E. Solute molecules would leave the cell by osmosis.
A segment of DNA that specifies a sequence of amino acids in a polypeptide is called a(n)
a. codon. b. intron. c. messenger. d. gene. e. enzyme
Translation is initiated at the ____
a. AUG codon b. UAG codon c. anticodon d. promoter e. downstream sequence
Gametophytes are diploid; sporophytes are haploid.
a. true b. false