The three most common shapes of prokaryotes are
A. cubical, spherical, and rod-shaped.
B. rod-shaped, star-shaped, and cubical.
C. spherical, spiral, and thread-like.
D. star-shaped, cubical, and spherical.
E. spherical, rod-shaped, and spiral.
E. spherical, rod-shaped, and spiral.
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The cohesion-tension theory indicates that the water located in the ________ is under a constant state of ________ pressure
a. phloem, positive b. xylem, negative c. xylem, positive d. xylem, partial e. phloem, negative
A marine biologist compares 2 samples of reef-building coral colonies collected from various locations on a coral reef. One colony has thick, stout branches while the other has long, thin branches. Are these different species? Discuss why or why not. How could the biologist solve this question?
What will be an ideal response?
Some plants require water for reproduction. This is because
a. it is needed for germination of the spores. b. the eggs would dry out otherwise. c. the sperm are motile and need to swim to the egg to accomplish fertilization. d. the plants must be actively growing in order to reproduce. e. the seeds will be carried on the water to new sites.
Isotopes of an element have the same number of ________ and different numbers of ________
A) protons... neutrons B) protons... electrons C) neutrons... protons D) electrons... protons