 |
| 1 | |
Which of the following is not part of the modern cell theory? |
| | A) | All organisms are composed of cells. |
| | B) | The cell is the simplest structural and functional unit of life. |
| | C) | An organism's structure and all of its functions are due to the activities of its cells. |
| | D) | Cells arise by spontaneous generation |
|
|
|
| 2 | |
What type of cells are thick in the middle and tapered toward their ends? |
| | A) | fusiform |
| | B) | stellate |
| | C) | discoid |
| | D) | spheroid |
|
|
|
| 3 | |
What size (in diameter) are most human cells? |
| | A) | 10-15 nm |
| | B) | 10-15 µm |
| | C) | 0.1 mm |
| | D) | 10-15 Angstroms |
|
|
|
| 4 | |
Membrane phospholipids arrange themselves with their hydrophilic ends toward the _________ of the membrane and their hydrophobic ends toward the ________ of the membrane. |
| | A) | external face, internal face |
| | B) | internal face, external face |
| | C) | surface, center |
| | D) | center, surface |
|
|
|
| 5 | |
A protein that adheres to the intracellular face of the plasma membrane is called a(n) |
| | A) | peripheral protein. |
| | B) | integral protein. |
| | C) | transmembrane protein. |
| | D) | none of the above |
|
|
|
| 6 | |
G proteins |
| | A) | are peripheral proteins. |
| | B) | are activated by surface receptors. |
| | C) | relay hormone and neurotransmitter stimuli to secondary messengers. |
| | D) | all of the above |
|
|
|
| 7 | |
Both cilia and microvilli are important parts of sensory cells. |
| | A) | True |
| | B) | False |
|
|
|
| 8 | |
Microvilli are characterized by all of the following except |
| | A) | they appear as a brush border. |
| | B) | their primary function is absorption. |
| | C) | they have a chloride pump. |
| | D) | they increase the surface area of a cell. |
|
|
|
| 9 | |
In cystic fibrosis, the cilia become embedded in sticky mucus due to a malfunction of the |
| | A) | chloride pump. |
| | B) | power stroke. |
| | C) | recovery stroke. |
| | D) | mucous glands. |
|
|
|
| 10 | |
The function of rough endoplasmic reticulum is |
| | A) | synthesis of ribosomes. |
| | B) | detoxification. |
| | C) | synthesis of large amounts of protein. |
| | D) | manufacturing and packaging of carbohydrates. |
|
|
|
| 11 | |
Mitochondria are characterized by |
| | A) | vesicles containing enzymes used to hydrolyze substrates. |
| | B) | the production of hydrogen peroxide and catalase enzymes. |
| | C) | a small, circular DNA molecule outside of the nucleus. |
| | D) | a cylindrical assembly of microtubules. |
|
|
|
| 12 | |
When blood pressure in capillaries forces water and dissolved solutes out into the tissue fluid, this is called |
| | A) | filtration. |
| | B) | diffusion. |
| | C) | osmosis. |
| | D) | osmotic pressure. |
|
|
|
| 13 | |
The net movement of water through a selectively permeable membrane is called |
| | A) | filtration. |
| | B) | diffusion. |
| | C) | osmosis. |
| | D) | osmotic pressure. |
|
|
|
| 14 | |
The net movement of molecules from an area of high concentration to an area of low concentration is called |
| | A) | filtration. |
| | B) | diffusion. |
| | C) | osmosis. |
| | D) | osmotic pressure. |
|
|
|
| 15 | |
The hydrostatic pressure required to stop osmosis is known as |
| | A) | filtration pressure. |
| | B) | diffusion pressure. |
| | C) | transport pressure. |
| | D) | osmotic pressure. |
|
|
|
| 16 | |
Blood cells in a hypotonic solution will |
| | A) | burst (hemolysis). |
| | B) | shrink (crenation). |
| | C) | stay the same size. |
| | D) | plasmolyze. |
|
|
|
| 17 | |
Blood cells in a 0.9% NaCl solution will |
| | A) | burst (hemolysis). |
| | B) | shrink (crenation). |
| | C) | stay the same size. |
| | D) | plasmolyze. |
|
|
|
| 18 | |
The Na+ K+ pump is associated with |
| | A) | active transport. |
| | B) | resting membrane potential. |
| | C) | antiporters and symporters. |
| | D) | all of the above. |
|
|
|
| 19 | |
Insulin is removed from the bloodstream by the endothelial cells by which of the following methods? |
| | A) | receptor-mediated endocytosis |
| | B) | fluid phase pinocytosis |
| | C) | endocytosis |
| | D) | exocytosis |
|
|
|
| 20 | |
Pasteur provided experiments that disproved this idea: |
| | A) | the cell theory |
| | B) | evolution |
| | C) | every cell from a cell |
| | D) | spontaneous generation |
| | E) | fluid-mosaic model |
|
|
|
| 21 | |
The cell membrane is made up mainly of: |
| | A) | proteins and phospholipids |
| | B) | carbohydrates and steroids |
| | C) | phospholipids and cholesterol |
| | D) | glycolipids and phospholipids |
| | E) | proteins and glycolipids |
|
|
|
| 22 | |
Membrane proteins that aid in communications from other cells are: |
| | A) | clonal proteins |
| | B) | motor molecules |
| | C) | receptors |
| | D) | glycocalyx |
| | E) | carriers |
|
|
|
| 23 | |
These increase a cell's external surface area and are found on intestinal cells: |
| | A) | cilia |
| | B) | microvilli |
| | C) | flagellae |
| | D) | glycocalyx |
| | E) | ribosomes |
|
|
|
| 24 | |
These organelles are carbohydrate factories: |
| | A) | ribosomes |
| | B) | microtubules |
| | C) | peroxisomes |
| | D) | nuclei |
| | E) | Golgi complexes |
|
|
|
| 25 | |
Much of a normal cell's ATP is produced in these: |
| | A) | microtubules |
| | B) | lysosomes |
| | C) | centrioles |
| | D) | nuclei |
| | E) | mitochondria |
|
|
|
| 26 | |
Of the following factors, which does not affect the rate of diffusion through a membrane? |
| | A) | ATP available |
| | B) | kinetic energy of the particles |
| | C) | molecular weight |
| | D) | number of microvilli per unit area |
| | E) | permeability of membrane |
|
|
|
| 27 | |
Where the extracellular fluid is more highly concentrated than the intracellular fluid, we may say it is: |
| | A) | osmotic |
| | B) | actively transported |
| | C) | hypertonic |
| | D) | isotonic |
| | E) | hypotonic |
|
|
|
| 28 | |
By what method can the intestinal cells absorb sodium ions if they are in higher concentration inside the cell? |
| | A) | active transport |
| | B) | osmosis |
| | C) | diffusion |
| | D) | facilitated diffusion |
| | E) | filtration |
|
|
|
| 29 | |
Large molecules, such as insulin, may be transported through cells by this specific process: |
| | A) | secondary active transport |
| | B) | receptor-mediated endocytosis |
| | C) | exocytosis |
| | D) | phagocytosis |
| | E) | facilitated diffusion |
|
|
.