Which two cellular components are enclosed by a membrane?
a. ribosomes and peroxisomes
b. microtubules and cytosol
c. Golgi apparatus and peroxisomes
d. chloroplasts and microtubules
e. endoplasmic reticulum and ribosomes
ANSWER: c
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Cyclic electron flow generates ATP and O2, but not NADPH
a. True b. False
One way the intensity and extent of a stimulus is registered is by the frequency of action potentials traveling along the
axons of afferent neurons.
Indicate whether the statement is true or false.Which one of the following is not important to the concept of homology?
A. Features must share a common developmental pattern. B. Species with homologous features must be related. C. Homologous features must be found in a common ancestor. D. It can include anatomical, physiological, or molecular features. E. None of the features being compared can be vestigial.
This summer, you are returning to the research station in Costa Rica to follow up on the population of butterflies you have been studying. You are disappointed to find that there are fewer this year than last. In fact, at dinner your friends studying frogs and birds are complaining about the same thing. What type of influence do you suspect?
A. A density-dependent effect like environmental disruption B. A density-independent effect like an introduced predator C. A density-dependent effect like an introduced predator D. A density-independent effect like environmental disruption