#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: 12184
#Unit 1. Molecules and their Interaction Relevant to Biology
#Question id: 78
#Unit 1. Molecules and their Interaction Relevant to Biology
Which is true about naturally occurring monosaccharides?
#Question id: 79
#Unit 1. Molecules and their Interaction Relevant to Biology
The structure of D-arabinose is shown below. How many stereoisomers are possible for this molecule?
#Question id: 80
#Unit 1. Molecules and their Interaction Relevant to Biology
Examine the Fischer projection below. How is this carbohydrate classified
#Question id: 81
#Unit 1. Molecules and their Interaction Relevant to Biology
The Fischer projections of linear D-glucose and D-galactose are shown below. These two molecules are