In animal cells, microtubules grow from
A. the plasma membrane.
B. the outer membrane of the nuclear envelope.
C. centrosomes containing centrioles.
D. dimerization centers located throughout the cytosol.
E. the tips of the chromosomes.
C. centrosomes containing centrioles.
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True or False: A biological clock is a set of molecular mechanisms that cycles on its own and thus keeps a regular rhythm
A. true B. false
What is the variance for the mother's and daughter's heights?
A. Mothers: 42.21Daughters: 24.26 B. Mothers: 41.32Daughters: 23.71 C. Mothers: 43.78 Daughters: 24.26 D. Mothers: 42.21 Daughters 23.78
Which of the following would not be considered part of the peripheral nervous system?
a. the eyes b. the spinal cord c. afferent neurons d. the ears e. efferent neurons
Fruit ripening represents an example of positive feedback. Which one of the following statements accurately justifies why the process of fruit ripening involves positive feedback?
A) Once seeds have reached maturity, chemical signals increase enzymatic activity in fruit to convert sugars into starches, thicken pulp, and maintain color in the fruit. B) Once seeds have reached maturity, chemical signals block enzymatic steps that normally convert sugars into starches and sugars accumulate from photosynthetic activity within the fruit. C) Chemical signals initiate a process that triggers enzymatic activity, which involves converting starches into sugars, softening of pulp, and color change of fruit. D) Chemical signals shut down enzymatic activity within the fruit, which results in breakdown of starches into sugars, softening of pulp, and color change of fruit.