Active transcription occurs in regions of chromatin loops that are located __________
A) near the MARS
B) a large distance away from the MARS
C) within the linker DNA
D) within the telomeres
E) within the euchromatin and constitutive heterochromatin
B
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Answer the following statements true (T) or false (F)
1. Plant behavior is defined as response to stimuli. 2. Plant hormones (growth regulators) can travel from cell to cell within the plant only if they are moved by electrical impulses. 3. Plants grow towards light because they sense a need for light. 4. The production of roots on cuttings of a houseplant is promoted when auxins are applied to the cut ends.
Bones are _____
a. mineral reservoirs b. skeletal muscle's c. sites where blood cells form (some bones only) d. all of these
Branching of actin filaments can be initiated by
a. Arp2/3 b. formin c. ADR/cofilin d. fibrin e. none of the above
The basis for muscle contraction is
a. rotation of myosin fibers around actin fibers. b. expansion of the sarcomere. c. the sliding of myosin and actin fibers past one another. d. movement of the Z discs away from one another.