What is the primary function of the transverse tubules?
A. Conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils.
B. Act as a channel for Ca2+ ions during excitation-contraction coupling.
C. Form cross-bridges between actin and myosin during muscle contraction.
D. Attach troponin to tropomyosin.
E. Attach muscle fibers to skeletal elements to exert force.
A. Conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils.
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The greatest expression of the lac operon occurs when lactose levels are _____
A) low and glucose levels are low B) low and glucose levels are high C) high and glucose levels are low D) high and glucose levels are high
Sponges are considered:
a. animals. b. plants. c. fungi. d. bacteria. e. Archaea.
Which of the following is NOT a characteristic of bacterial chromosomes?
A. they contain gene coding regions and regulatory regions B. they are around 10× smaller than eukaryotic chromosomes C. they are single-stranded D. they have 10-base-pair regions that control DNA folding E. they have only one origin of replication
Appraise and evaluate the following statement, and cite evidence from the chapter as appropriate: Despite having a closer "outward" appearance to plants in some ways, evidence support fungi as being far more closely related to animals than plants
What will be an ideal response?