Parental care requires time and energy that an individual could otherwise invest in reproducing again. What determines how much parental care is given?
What will be an ideal response?
The degree of parental care rises only if the genetic benefit of providing care (increased offspring survival now) offsets the cost (reduced opportunity to produce offspring later).
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Compare a pseudocoelom to a coelom.
A. A coelom is completely enclosed by mesoderm whereas a pseudocoelom has an outer covering of mesoderm and an inner one of endoderm. B. A pseudocoelom is completely enclosed by mesoderm whereas a coelom has an outer covering of mesoderm and an inner one of endoderm. C. The coelom is enclosed by ectoderm and the pseudocoelom is enclosed by endoderm. D. The pseudocoelom is enclosed by ectoderm and the coelom is enclosed by endoderm. E. The coelom is enclosed by ectoderm and the pseudocoelom is enclosed by mesoderm.
How does x-ray crystallography provide details about molecular structure?
a. Only DNA molecules scatter x-rays; therefore, this helped to prove that DNA was the genetic material in cells. b. X-rays are reflected by some atoms and absorbed by others; thereby giving clues to molecule structure. c. X-rays are scattered by atoms in a specific pattern, from which molecular size, shape, and spacing of repeating elements can be calculated. d. This technique captures photographs of magnified molecules. e. X-rays can be used to isolate DNA molecules from living organisms.
Imagine that you are monitoring a test subject's blood. The pH of the blood is steadily decreasing, while the carbon dioxide levels are steadily increasing. What do you predict will occur?
A. Because of the increase in carbon dioxide levels, the brain will decrease in the breathing rate. B. Because of the increase in carbon dioxide levels, the brain will stimulate an increase in the breathing rate. C. As soon as oxygen levels decrease, the brain will stimulate an increase in the breathing rate.
What term refers to an individual who has two copies of the same allele?
What will be an ideal response?