Color blindness is caused by heritable mutations in cone photoreceptors. How many cone types does the retina of a colorblind individual typically contain?
A. only one
B. two
C. three
D. four
E. five
B. two
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The Cambrian explosion refers to Earth's historical benchmark of life involving the
A. appearance of fossils for all major phyla of animals. B. origination of life, when the progenotes formed the first cells. C. All of the answer choices are correct. D. mass extinction of the nonavian dinosaurs. E. development of the first multicellular organisms.
Crossing over
a. increases variability in gametes. b. results in only one exchange per homologue. c. occurs between sister chromatids. d. prevents genetic recombination. e. is followed immediately by separation of each of the chromatids.
The pentose phosphate pathway can be characterized as an anabolic pathway
Indicate whether the statement is true or false
An unmanned spacecraft has been sent to another planet to detect other life forms that might be quite different from those on Earth. If the probe could only send back one still picture, which property or properties of life would be most evident?
What will be an ideal response?