SCI 335 Week 2 Quiz 3

SCI 335 Week 2 Quiz 3 | Wilmington University

Week 2 - Test Chapter 3

Question 1

Which of the following organelles has its structure and function correctly described?    

·         endoplasmic reticulum-network of interconnected membranes forming sacs and canals; packages protein molecules for secretion  

·         ribosomes-membranous vesicles; contain digestive enzymes  

·         Golgi apparatus-particles composed of protein and RNA; synthesizes proteins  

·         mitochondrion-nonmembranous structure that synthesizes proteins

Question 2

The structure and function of membrane proteins are    

·         tightly coiled rodlike molecules to make the membrane more permeable.  

·         bilayers of amino acids to give strength and shape to cell.  

·         globular proteins to create narrow passageways or channels.  

·         rigid double layer chains to make the membrane less permeable to water.

Question 3

A protein that is structurally part of the membrane is termed a(n)    

·         receptor protein.  

·         integral protein.  

·         peripheral protein.  

·         anchoring protein.

Question 4

The decrease in skeletal muscle size following a prolonged period of inactivity is most closely associated with the activity of    

·         peroxisomes.  

·         lysosomes.  

·         centrosomes.  

·         ribosomes.

Question 5

Organelles are distinguished from inclusions in that organelles are ______, whereas inclusions are ______.

·         functional structures; storage sites of lifeless chemical substances  

·         small organs; vital sites where important functions occur  

·         nonfunctional structures; functional structures  

·         masses of lifeless chemicals; masses of chemicals vital to life

Question 6

The outer membrane of the rough endoplasmic reticulum has organelles called ______ attached to it.

Question 7

Which of the following is isotonic to red blood cells?    

·         0.9% NaCl solution  

·         distilled water  

·         0.9% glucose solution  

·         None of these is correct.

Question 8

What occurs if a red blood cell is placed in a hypotonic solution?    

·         The cell will shrink.  

·         The cell will swell and may eventually burst.  

·         Nothing; the cell will remain the same size and shape.  

·         Only permeable substances will leave the cell; otherwise the concentrations within the cell do not change.

Question 9

The relationship of osmotic pressure and the number of solute particles in a solution is the    

·         lower the number of solute particles, the greater the osmotic pressure.  

·         greater the number of solute particles, the lower the osmotic pressure.  

·         greater the osmotic pressure, the lower the number of solute particles.

·         greater the number of solute particles, the greater the osmotic pressure.

Question 10

An isotonic solution    

·         contains the same concentration of solute particles as a cell.  

·         has water entering and leaving a cell in equal amounts.  

·         has the same osmotic pressure as the cells in the solution.  

·         All of these are correct.

Question 11

Filtration is defined as the movement of molecules through a membrane    

·         from low concentration to high concentration.  

·         by hydrostatic, or blood, pressure that is greater on one side of the membrane than on the other.  

·         from low to high hydrostatic pressure.  

·         from low osmotic pressure to high osmotic pressure.

Question 12

______ is the condition in which solute particles are evenly distributed in a solvent.

Question 13

The movement of sodium ions from a region of lower concentration inside a cell toward a region of higher concentration outside the cell is accomplished by ______ _______.

Question 14

Differentiation seems to result from    

·         different DNA information being "turned on" in different cells.  

·         different cells possessing different kinds of DNA information.  

·         different cells possessing different kinds of chromosomes.  

·         None of these is correct.

Question 15

Which of the following is characteristic of aging cells?    

·         Golgi apparatus becomes fragmented  

·         lipid inclusions accumulate  

·         glycogen-containing structures decrease  

·         All of these are correct.