What is the evidence for membrane fluidity?

What will be an ideal response?


Ans: Small holes in artificial bilayers seal themselves spontaneously. The fusion of membranes during vesicle formation and related processes suggests that membranes are fluid. The experiment illustrated in Figure 5.2 shows that proteins can diffuse in the plane of the membrane.

Biology & Microbiology

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List the six steps of one full cycle of the scientific method.

What will be an ideal response?

Biology & Microbiology

How does RNA polymerase II bind to the DNA?

a. It binds directly to the eukaryotic promoter sequence. b. It binds directly to the TATA box. c. It binds to transcription factors in the nucleus, and the complex then binds to the promoter. d. Transcription factors first bind to the promoter, then recruit RNA polymerase II. e. Some transcription factors bind to the promoter while others bind to RNA polymerase II, then the two groups of proteins bind to each other.

Biology & Microbiology

Functionally speaking, a nerve impulse is

a. a flow of electrons along the outside of the plasma membrane of a neuron. b. the movement of cytoplasmic elements through the core of the neuron. c. a series of changes in membrane potential. d. a lengthening and shortening of the membrane extensions of a neuron. e. a turning on and off of the sodium-potassium pumps of a neuron.

Biology & Microbiology

Which element is the basis for the macromolecules found in living things?

A) carbon B) hydrogen C) nitrogen D) oxygen

Biology & Microbiology