The relative sizes of roots and shoots are regulated by interactions between
A) ethylene and abscisic acid.
B) abscisic acid and cytokinins.
C) gibberellins and abscisic acid.
D) cytokinins and ethylene.
E) auxins and cytokinins.
E
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The accumulation of free oxygen in the
atmosphere a. was a result of the accumulation of a byproduct of a type of photosynthesis. b. prevented the further spontaneous generation of life. c. provided the opportunity to extract more energy through aerobic respiration. d. did not occur immediately after the earth was formed. e. did all of these.
A planula is a
a. sedentary, attached, tree-shaped form found in corals. b. swimming larval form with an outer ciliated epidermis. c. kind of parasitic worm. d. fleshy lobe that extends laterally from the body wall of a marine worm. e. rasplike tongue.
You find a strange infection in your mouth and visit your dentist. The dentist said the new organism was prokaryotic because it had ________
A) circular DNA B) DNA in the nucleus C) relatively large cells D) membrane-bound organelles
In science, theories tend to be _____ than hypothesis
a) more speculative b) less scientific c) broader in scope d) more experimental e) more empirical