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Bio 181 Quiz 2 with Correct Answers
- Course
- BIO 181
- Institution
- Grand Canyon University
This is document contains quiz 2 questions with correct answers for Bio 181. *Essential!! *For effective practice!! *For you!!
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1. Which of the following statements is correct about diffusion?a. It is very rapid over long distances
b. It requires an expenditure of energy by the cell
c. It is a passive process in which molecules move from a region of higher concentration
to a region of lower concentration
d. It is an active process in which molecules move from a region of lower concentration to
one of higher concentration
e. It requires integral proteins in the cell membrane
2. According to the fluid mosaic model of cell membranes, which of the following is a true
statement about membrane phospholipids
a. They can move laterally along the plane of a membrane
b. They frequently flip flop from one side of the membrane to the other
c. They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface
of the membrane
d. They are free to depart from the membrane and dissolve in the surrounding solution
e. They have hydrophobic tails in the interior of the membrane
3. Which of the following best summarizes the relationship between dehydration reactions and
hydrolysis?
a. Dehydration reactions assemble polymers, and hydrolysis break down polymers
b. Dehydration reactions eliminate water from lipid membranes, and hydrolysis makes lipid
membranes water permeable
c. Dehydration reactions can occur only after hydrolysis
d. Hydrolysis creates monomers, and dehydration reactions break down polymers
e. Dehydration reacts ionize water molecules and add hydroxyl groups to polymers;
hydrolysis reactions release hydroxyl groups from polymers
4. In a plant cell, DNA may be found
a. Only in the nucleus
b. Only in the nucleus and mitochondria
c. Only in the nucleus and chloroplasts
d. In the nucleus, mitochondria, and chloroplasts
e. In the nucleus, mitochondria, and chloroplasts and peroxisomes
5. A primary objective of cell fractionation is to
a. View the structure of cell membranes
b. Sort cells based on their size and weight
c. Determine the size of various organelles
d. Separate the major organelles so that their particular functions can be determined
e. Separate lipid soluble from water soluble molecules
6. Which structure is the site of the synthesis of proteins that may be exported from the cell
a. Rough ER
b. Lysosomes
c. Plasmodesmata
d. Golgi vesicles
e. Free cytoplasmic ribosomes
7. What results from an unequal sharing of electrons between atoms?
, a. A non-polar covalent bond
b. A polar covalent bond
c. An ionic bond
d. Hydrogen bond
e. A hydrophobic interaction
8. Movement of vesicles within the cell depends on what cellular structures?
a. Microtubules and motor proteins
b. Actin filaments and microtubules
c. Actin filaments and ribosomes
d. Centrioles and motor proteins
e. Actin filaments and motor proteins
9. Ions diffuse across membranes through specific ion channels
a. Down their chemical gradients
b. Down their concentration gradients
c. Down their electrical gradients
d. Down their electrochemical gradients
e. Down the osmotic potential gradients
10. The difference between pinocytosis and receptor mediated endocytosis is that
a. Pinocytosis brings only water molecules into the cell, but receptor mediated endocytosis
brings in other molecules as well
b. Pinocytosis increases the surface area of the plasma membrane whereas receptor
mediated endocytosis decreases the plasma membrane surface area
c. Pinocytosis is non-selective in the molecules it brings into the cell, whereas receptor
mediated endocytosis offers more selectivity
d. Pinocytosis requires cellular energy but receptor mediated endocytosis does not
e. Pinocytosis can concentrate substances from the extracellular fluid, but receptor
mediated endocytosis cannot
11. Which plant cell organelle contains its own DNA and ribosomes?
a. Glyoxysome
b. Vacuoles
c. Mitochondrion
d. Golgi apparatus
e. Peroxisome
12. The liver is involved in detoxification of my poisons and drugs. Which of the following structures
is primarily involved in this process and therefore abundant in liver cells?
a. Rough ER
b. Smooth ER
c. Golgi apparatus
d. Nuclear envelope
e. Transport vesicles
13. What maintains the secondary structure of a protein?
a. Peptide bonds
b. Hydrogen bonds between the amino groups of one peptide bond and the carboxyl
group of another peptide bond
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