Why do cells need membranes? What are the chemical properties of phospholipids that make them suited to this task? Incorporate the following terms into your answer: hydrophobic, hydrophilic, semi-permeable.

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Nestor RutherfordLv2

13 May 2018

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Related questions

1. predict the direction of water movement based on differences in solute concentrations. Use the terms osmotic pressure, hypotonic, isotonic, and hypertonic
2. Why do membranes have to be selectively permeable?

3. What determines whether a particular substance can diffuse (simple or facilitated) through a membrane?

4. What mechanisms drive molecules across membranes? Use the terms concentration gradient, (facilitated) diffusion and active transport.
5. Which parts of the plasma membrane proteins do you expect to be hydrophobic or hydrophilic? Justify your answer.
concise and short answers pls

Predict what amino acids line the inner channel of a protein that transports protons (H⁺) across membranes compared to the inner channel of a protein that transports a negatively charged substance across membranes.

A.Both channels are lined with hydrophobic amino acids

B.Both channels are lined with hydrophilic amino acids

C.The H⁺ transporterâs inner channel is lined with hydrophobic amino acids; the other transport proteinâs inner channel is lined with hydrophilic amino acids.

D.The H⁺ transporterâs inner channel is lined with hydrophilic amino acids; the other transport protein is lined with hydrophobic amino acids.

E.One cannot answer this question without knowing what the other transported substance is.

blackmule728

1)(a) Saturated fatty acid tails have a different shape than unsaturated fatty acid tails. Briefly explain what this means in terms of chemical bonds.

(b) How does the difference in chemical bonds between saturated and unsaturated fatty acids affect the shape of these molecules.

(c) Cell membranes are made mostly of phospholipids (which contain fatty acids) that must maintain fluidity. What type of phospholipids would be better at maintaining fluidity: saturated phospholipids or unsaturated phospholipids? Explain your answer (and make sure your explanation relates to part b).