Chromosomes are visible only
a. as chromatin.
b. during cell division.
c. in eukaryotic cells.
d. within the nucleolus.
e. through the use of transmission electron microscopy.
B
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Gap genes are sold in the most fashionable malls in America
A. true B. false
The acid growth hypothesis links
A. oligosaccharins to pH changes. B. cytokinin to thigmonasty. C. auxin to cell wall expansion. D. gibberellin to root elongation. E. ethylene to leaf abscission.
A gene that specifies the fate of a particular anatomical segment in Drosophila is called a(n) ________
Fill in the blank(s) with correct word
Which of the following elements of the sliding-filament model of muscle contraction is incorrectly defined?
a) tropomyosin—a regulatory protein b) troponin complex—a set of additional regulatory proteins c) transverse tubules—infoldings of the plasma membrane d) sarcoplasmic reticulum—a specialized endoplasmic reticulum e) calcium ions—ions bound to the myosin protein that play a role in muscle contraction and relaxation