A mature ovary, specialized as a vessel that houses and protects seeds, is a
A) fruit.
B) ovule.
C) cotyledon.
D) seed coat.
Answer: A
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Which component of a negative feedback mechanism is responsible for producing the effect that
counteracts the original environmental change away from homeostasis?
a. sensor b. response c. effector d. stimulus e. integrator
The event that occurs in bacteriophage multiplication that does not occur in animal virus replication is
A. host cell synthesis of viral enzymes and capsid proteins. B. assembly of nucleocapsids. C. replication of viral nucleic acid. D. injection of only the viral nucleic acid into the host cell. E. adsorption to the host cells.
Compare and contrast the digestive process in animals with two-way flow through their digestive
system and those that have a digestive system with one-way flow. What will be an ideal response?
The cylinders in this experiment represent a 24-hour period. The light area represents light periods during a 24-hr. period and the dark area represents dark periods during a 24-hr. period. The critical length of dark vs. light periods for flowering is depicted by the dotted line. Note that some plants are flowering and some are not flowering. Study the results of this experiment on photoperiodism and flowering to determine whether the following statements are true or false.Short-day plants flower when the day length is shorter than the critical length, but the required dark period is interrupted by a flash of light.
Answer the following statement true (T) or false (F)