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Exam 4: Biology of the Cell

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Question 61

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As potassium diffuses down its concentration gradient,it moves out of the cell.However,this movement is resisted by the accumulating negative charge outside the cell.As potassium diffuses out of a cell,positive charges accumulate outside the cell (due to both potassium and sodium).This serves as some resistance against potassium diffusion and contributes to an equilibrium that is reached.

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B) False

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Question 62

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The amount of rough ER is greater in cells producing large amounts of protein for secretion.

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B) False

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Question 63

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Diffusion rate is fastest when the concentration gradient is

A start codon consists of the three-base sequence AUG.

Lysosomes contain enzymes that prepare the vesicles that will be used by the Golgi apparatus to package its secretory products.

Tight junctions provide direct passageways for substances to travel between neighboring cells.

The organelles responsible for organizing microtubules that are part of the mitotic spindle are called

Water can cross cell membranes only by way of channel-mediated diffusion.

Which is not one of the bases found in DNA nucleotides

Transmission electron microscopy (TEM)uses an electron beam to create an image for viewing.

The microscope of choice for a detailed three-dimensional study of the surface of a specimen is the

Movement of a substance from an area of higher concentration to one where it is less concentrated is known as

Consider a cell with a total internal solute concentration of 0.9%.Placing the cell in which bath solution would result in creation of the greatest osmotic pressure in the cell

Which of the following shows the correct sequence of mitosis

Symport active transporters move two substances across the membrane in the same direction.

A membrane that is able to regulate the movement of materials in and out of the cell is described as being _________ _________ (2 words).

Among the functions of the plasma membrane are to form specialized intercellular connections,provide for selective permeability,and facilitate the recognition and response to molecular signals.

Mitochondria engage in aerobic cellular respiration to complete the digestion of fuel molecules to allow for transfer of energy for the synthesis of ATP.

Cartilage cells and intestinal lining cells are described as being cube-shaped.

Coupled transport that involves the moving of one substance against its concentration gradient by using energy from a second substance moving down its concentration gradient is known as