A botanist discovers a new species of plant in a tropical rain forest. After observing its anatomy and life cycle, the following characteristics are noted: flagellated sperm, xylem with tracheids, separate gametophyte and sporophyte generations with the sporophyte dominant, and no seeds. This plant is probably most closely related to
A) mosses.
B) charophytes.
C) ferns.
D) gymnosperms.
E) flowering plants.
Answer: C) ferns.
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Matter is composed of:
A. molecules B. mass C. energy D. atoms
Squids and octopuses move by means of water movement through their
A. tentacles. B. cilia and flagella. C. modified mantle cavity. D. muscular foot. E. radula.
Which of the following best describes the addition of nucleotides to a growing DNA chain?
A) A nucleotide triphosphate is added to the 5' end of the DNA, releasing a molecule of pyrophosphate. B) A nucleotide triphosphate is added to the 3' end of the DNA, releasing a molecule of pyrophosphate. C) A nucleotide diphosphate is added to the 5' end of the DNA, releasing a molecule of phosphate. D) A nucleotide diphosphate is added to the 3' end of the DNA, releasing a molecule of phosphate. E) A nucleotide monophosphate is added to the 5' end of the DNA.
Position effect variegation generally results from
a. a chromosome rearrangement that puts a gene in a region adjacent to heterochromatin. b. a chromosome rearrangement with a breakpoint in the middle of a gene. c. a chromosome rearrangement that puts a gene near a strong promoter. d. point mutations in a gene. e. transcription factors activating genes in some cells and not others.