Biology Exam 2

Question 1

Prokaryotic cells lack:

Answer 1

Organelles

Question 2

Which statement is false regarding prokaryotic cells?

Answer 2

They contain cytoplasm but never a plasma membrane.

Question 3

Eukaryotic cells may contain all of the following except:

Answer 3

A peptidoglycan cell wall

Question 4

Which of these is a cellular characteristic of all eukaryotes?

Answer 4

Nuclear membrane

Question 5

Hydrophobic molecules can pass freely through the plasma membrane, but ions and polar molecules are impeded by the hydrophobic core. For this reason, plasma membranes can be considered

Answer 5

Partially permeable

Question 6

The lipids within the fluid mosaic of the plasma membranes are held in place by:

Answer 6

Hydrophobic interactions

Question 7

Which structures is(are) not present in the cell membrane?

Answer 7

A rigid matrix of actin and tubular fibers

Question 8

The chemicals in “beta-blocker” drugs reduce anxiety symptoms by:

Answer 8

Binding to beta-receptors, thereby preventing adrenaline from binding to the cell

Question 9

Passive transport, which is the movement of molecules from areas of high concentration to that of low concentration across the membrane, is usually coupled to processes that

Answer 9

gain energy for the cell

Question 10

If the solution surrounding a cell contains more solute than the cytoplasm inside the cell, the outside solution is said to be:

Answer 10

Hypertonic

Question 11

You are bored at a lunch meeting and surreptitiously place a raisin in your glass of water. The raisin swells to twice its original size. Relative to the water, the raisin must have been:

Answer 11

Hypertonic

Question 12

Which statement best summarizes the differences between osmosis and diffusion?

Answer 12

Osmosis deals only with water

Question 13

The primary function of molecular membranes is the transport of ions and molecules in and out of cells. The movement of molecules from areas of low concentration to those of high concentration against chemical gradients is best described as:

Answer 13

channel-mediated diffusion

Question 14

The ________ is the largest structure in eukaryotic cells. It is surrounded by a membrane structure that consists of two ________.

Answer 14

Nucleus; bilayers

Question 15

Which statement about mitochondria is true?

Answer 15

Most plant cells contain mitochondria

Question 16

Which organelle is responsible for degrading waste within the cell?

Answer 16

lysosome

Question 17

What makes the rough endoplasmic reticulum rough?

Answer 17

Covered with ribosomes

Question 18

The Golgi apparatus:

Answer 18

processes and packages proteins, lipids, and other molecules

Question 19

Although cells tend to be spherical, several factors influence cells to assume other shapes. Which of these does not influence cell shape?

Answer 19

Number of mitochondria