A&P Exam #1

The term secretion refers to A) the process by which a cell releases a substance into the extracellular space. B) synthesis of a protein for export from the cell. C) the manufacture and assembly of a material. D) storage of a material, until it is time for it to leave the cell. E) None of the answers describe secretion.

A) the process by which a cell releases a substance into the extracellular space.

The space that is surrounded by the tissue wall of hollow organs is known as the A) peritoneal cavity. B) lumen. C) extracellular space. D) epidural space. E) tract.

B) lumen

The beta cells of the pancreas produce insulin, a protein hormone. Which organelle would be found in higher levels in the beta cells? A) mitochondria B) ribosomes C) microvilli D) Lysosomes E) All of the above

B) ribosomes

This junction contributes to the blood-brain barrier. A) gap junction B) tight junction C) anchoring junction D) desmosome E) neuromuscular junction

B) tight junction

An immunoliposome is a liposome that A) suppresses the immune system. B) stimulates the immune system. C) can recognize cancer cells. D) None of the above are correct

C) can recognize cancer cells.

The watery medium that surrounds a cell is known as A) cytosol. B) protoplasm. C) extracellular fluid. D) cytoplasm. E) intracellular fluid.

C) extracellular fluid.

Which structure is NOT involved in storage? A) lysosomes B) peroxisomes C) mitochondrial cristae D) storage vesicles E) All are involved in cellular storage.

C) mitochondrial cristae

Which is NOT made in smooth or rough endoplasmic reticulum? A) proteins B) fatty acids C) steroids D) RNA E) phospholipids

D) RNA

You discovered a new cell that lacks lysosomes. This cell would NOT be able to A) synthesize lipids. B) synthesize enzymes. C) destroy H2O2 (hydrogen peroxide) D) digest cellular wastes and bacteria. E) transport water-soluble molecules.

D) digest cellular wastes and bacteria

Intermediate filaments A) provide the cell with strength. B) stabilize the position of organelles. C) transport materials within the cytoplasm. D) form the neurofilaments in nerve cells. E) All of the above are correct.

E) All of the above are correct.

Microtubules A) are composed of tubulin. B) are hollow, filamentous structures. C) form cilia that aid in cell movement. D) are the largest cytoplasmic fibers. E) All of the above are correct.

E) All of the above are correct.

A liposome is a A) medium to deliver cosmetics. B) medium to deliver drugs. C) a type of lipid. D) a structural part of cell membranes. E) a medium to deliver cosmetics and drugs.

E) a medium to deliver cosmetics and drugs.

Which of the following is NOT a function of membrane proteins? A) respond to extracellular molecules B) creating junctions between cells C) act as transport molecules for various solutes D) anchor or stabilize the cell membrane E) produce energy

E) produce energy

If the adrenal cortex produces lipid hormones such as aldosterone, which organelle would be higher in cells of the adrenal cortex? A) Golgi apparatus B) mitochondria C) ribosome D) rough endoplasmic reticulum E) smooth endoplasmic reticulum

E) smooth endoplasmic reticulum

What is/are the major role(s) of the phospholipid bilayer in the cellular membrane? A) the absorption of fats only B) the formation of a barrier that is selective for lipid-soluble molecules C) to provide a framework for membrane proteins only D) to carry water-soluble molecules through a hydrophobic environment E) the formation of a barrier that is a selective for lipid-soluble molecules and to provide a framework for membrane proteins

E) the formation of a barrier that is a selective for lipid-soluble molecules and to provide a framework for membrane proteins