Following statements are regarding to the fluidity of a bilayer.

A. A lipid bilayer cools below a characteristic transition temperature, it undergoes a sort of phase change in which it becomes a liquid; that is, it loses its fluidity.

B. Above the transition temperature, the highly mobile lipids are in a state known as a liquid crystal.

C. The bilayer is thicker in the gel state than in the liquid crystal state due to the stiffening of the hydrocarbon tails at lower temperatures.

D. The transition temperature of a bilayer decreases with the chain length and the degree of saturation of its component fatty acid residues for the same reasons that the melting points of fatty acids increase with these quantities.

Which of the following combination is correct?

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#Question id: 8852

#Unit 9. Diversity of Life Forms

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?

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#Question id: 9186

#Unit 9. Diversity of Life Forms

A pathogenic fungus invades a plant. What does the infected plant produce in response to the attack?

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#Question id: 11222

#Unit 7. System Physiology – Animal

A chemical that affects neuronal function but is not stored in presynaptic vesicles is ________.

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#Question id: 26480

#Unit 2. Cellular Organization

Optimal length of prokaryotic promoter should be

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#Question id: 1017

#Unit 4. Cell Communication and Cell Signaling

The outbreak of measles within the last few years was due to