If asked to find the cause of regular fluctuations in a population's size not associated with seasonal environmental variation, you would probably first seek evidence for: 

#Question id: 2271

#Unit 1. Molecules and their Interaction Relevant to Biology

Depolymerization of microtubules is inhibited by

#Question id: 2290

#Unit 1. Molecules and their Interaction Relevant to Biology

The cytoskeleton includes all of the following except

#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?