#Question id: 2585
#Unit 2. Cellular Organization
Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber?
A. Tropomyosin shifts and unblocks the cross-bridge binding sites.
B. Calcium is released and binds to the troponin complex.
C. Transverse tubules depolarize the sarcoplasmic reticulum.
D. The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP.
E. An action potential in a motor neuron causes the axon to release acetylcholine, which depolarizes the muscle cell membrane.
#Question id: 29070
#Unit 10. Ecological Principles
Which of the following prediction is applicable for semelparous reproductive strategy?
#Question id: 14901
#Unit 6. System Physiology – Plant
#Question id: 11530
#Unit 6. System Physiology – Plant
Went used Avena sativa (oat) coleoptiles in a technique called the
#Question id: 3667
#Unit 3. Fundamental Processes
In an ______________ plasmid, replication occurs in two stages. In the first stage, the double stranded circular plasmid DNA replicates to form another double-stranded circular DNA and a single-stranded circular DNA, In the second stage, the complementary strand is synthesized on the single-stranded DNA to make another double-stranded DNA.