Keystone species:a
are always symbionts.
b. are typically not the most abundant species in the community.
c. illustrate secondary succession.
d. always form the base of a food chain.
e. are only found in tropical communities.
B
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The physical distribution of cytoplasmic material into the two daughter cells in plant cells is referred to as:
A. The gap phase B. Cytokinesis C. Binary fission D. Interphase
Some researchers have suggested that archaeal flagella be renamed as archaella because
A. archaean flagella are solid and not hollow. B. they are more slender than bacterial flagella. C. archaean flagella are composed of more than one type of flagellin subunit. D. some archaeon flagella don't have hooks. E. All of the choices are correct.
In the case of temperature regulation, an example of an effector is
a. a receptor in the brain. b. a center in the brain. c. a shivering skeletal muscle. d. none of the above.
Match the letter of each example from childbirth to the appropriate component of a positive feedback loop.A. pituitary gland secretes oxytocin, which acts on the uterusB. uterine contractions increaseC. fetus is pushed against uterine openingD. receptors detect stretchE. brain receives and compares stretch informationIntegrating Center
What will be an ideal response?