#Question id: 21137
#Unit 12. Applied Biology
#Question id: 2585
#Unit 1. Molecules and their Interaction Relevant to Biology
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: 29519
#Unit 6. System Physiology – Plant
Younger leaves exhibit more robust inducible defenses to herbivores than older leaves this is explained by
#Question id: 27024
#Unit 10. Ecological Principles
Monophagous herbivores, such herbivore feed on one plant species or just a few closely related species, examples are
#Question id: 4174
#Unit 3. Fundamental Processes
Which is not true about the genetic code?