In the figure above, which DNA fragment is closest to the positive electrode?
a. A
b. B
c. E
d. G
e. H
B
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Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber?
1. Tropomyosin shifts and unblocks the cross-bridge binding sites. 2. Calcium is released and binds to the troponin complex. 3. Transverse tubules depolarize the sarcoplasmic reticulum. 4. The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP. 5. An action potential in a motor neuron causes the axon to release acetylcholine, which depolarizes the muscle cell membrane. A) 1 ? 2 ? 3 ? 4 ? 5 B) 2 ? 1 ? 3 ? 5 ? 4 C) 2 ? 3 ? 4 ? 1 ? 5 D) 5 ? 3 ? 1 ? 2 ? 4 E) 5 ? 3 ? 2 ? 1 ? 4
What is the key concept addressed by the question?
What will be an ideal response?
When two genes are located on different chromosomes, ____ of the offspring from a testcross for genetic linkage
should have a recombinant phenotype
a. over 75% b. about 50%
c. about 25% d. about 10% e. about 5%
Coral diversity is greatest in the Caribbean
Indicate whether the statement is true or false