All the following statements about the concept of niche are true, EXCEPT -
a) A niche is the range of conditions an organism can survive in
b) The fundamental niche is always a subset of the realized niche
c) The niche of an organism is influenced by predators and competitors
d) The fundamental niche is all the environmental conditions that allow a species to maintain a stable population size
e) None of the above (all are true)
Answer: b) The fundamental niche is always a subset of the realized niche
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__________ and _________ are released by neurons of the adrenal medulla and cause a fight-flight
response as does stimulation by the sympathetic nervous system. Fill in the blank(s) with the appropriate word(s).
Cells change shape during embryogenesis due to
a. altering of the microtubules in the cells. b. adhesive proteins on the surface of the cell. c. cell migration due to a chemical smell. d. physical signals from the environment. e. none of these.
Describe the difference between incomplete penetrance and variable expressivity. It is often difficult to pinpoint the cause of incomplete penetrance or variable expressivity. What possible interactions may be responsible?
What will be an ideal response?
DNA methylation is the only known natural modification of DNA. It affects
A. cytosine bases. B. thymine bases. C. guanine bases. D. adenine bases.