Millions of years ago, the activity of which cellular organelle would have been dependent upon the presence of
cyanobacteria?
a. Golgi
b. nucleus
c. ribosome
d. mitochondrion
e. endoplasmic reticulum
d
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The nitrogen-limitation hypothesis states that organisms select food in terms of the nitrogen content of the tissue. Why might this be true?
A. Animal tissue contains about 10 times as much nitrogen as plant tissue. B. Animals are able to "fix" nitrogen much more effectively than plants. C. Herbivores prefer plants with lower nitrogen content. D. High nitrogen levels are a key part of plant chemical defenses. E. Plant tissue contains about 10 times as much nitrogen as animal tissue.
The two major divisions of the vertebrate
nervous system are the a. autonomic and peripheral systems. b. sympathetic and parasympathetic systems. c. cranial and spinal nerves. d. central and peripheral nervous systems. e. brain and spinal cord
A neuron generates a(n) ________ when stimuli reach or exceed the neuron's threshold
Fill in the blank(s) with correct word
Which organelle synthesizes phospholipids, fats, and steroids?
a) Chloroplast b) Rough endoplasmic reticulum c) Smooth endoplasmic reticulum d) Golgi complex