BIO111A-CH 5 HW

Which sequence accurately describes the path traveled by a new protein from when it first starts to be translated to its release from the cell?

cytosol → ER → Golgi → vesicle → plasma membrane → external environment

A cell has a mutation that prevents it from breaking down unwanted proteins present in vesicles. Which cellular structure is most likely to be disrupted by this mutation?

lysosomes

RNA molecules are transported from the nucleus to the cytoplasm in eukaryotes through

nuclear pores

Based on the two-step model of glucose transport, what would happen if the supply of ATP was depleted from the cell?

The sodium-potassium pump would make less of a sodium gradient, so less glucose could be transported across the membrane.

Why does active transport of molecules across a membrane require ATP?

An input of energy is needed to allow the movement of molecules from an area of low concentration to one of higher concentration.

Which statement is true about the presence or absence of plasma membranes?

All cells have a plasma membrane.

Imagine a cell that has a membrane composed mostly of lipids with saturated fatty acid tails, and that this membrane also has low cholesterol content. What are the characteristics of this cell membrane?

Due to its low cholesterol content, the cell membrane would lose its fluidity at cold temperatures.

Predict how phospholipids would arrange if they were placed in a nonpolar solution rather than a polar solution like water.

The phospholipid tails would orient toward the solution, and the heads would cluster away from the solution.

A beaker contains two solutions of salt dissolved in water. The two solutions have different concentrations of salt (measured by molarity, M) and are separated by a membrane that is permeable to both salt and water. The salt and water will move through the membrane by diffusion.

There will be a net movement of salt from side B to side A and net movement of water from side A to side B

What would be found in the cells of a blade of grass but not in the cells of an insect feeding on that grass?

chloroplasts