The observed "puffs" in the polytene chromosomes of Drosophila are sites of
A) attenuation.
B) condensation.
C) induction.
D) transcription.
E) translation.
Answer: D
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The endosymbiotic theory says that precursor eukaryotic cells acquired cilia by endosymbiosis with a(n) ________ ancestor and others gained photosynthetic ability from endosymbiosis with a(n) ________ ancestor.
A. helminth, algal B. spiral, cyanobacterial C. protozoan, algal D. archaeal, cyanobacterial
Which environment would be most likely to produce trees without annual rings?
a. tropical rain forest b. northern evergreen forest c. areas with alternating wet and dry seasons d. temperate-deciduous forests e. annual rings are characteristic of all trees
When a cell is placed in an isotonic solution, water molecules will cross the cell membrane.
A) True B) False
The large seaweed known as kelp is classified as a member of the
A) Chlorophyta. B) Phaeophyta. C) Chrysophyta. D) Rhodophyta. E) Deuteromycete.