Cells APHY101 Exam Questions With Marking Scheme
What are two functions of the cell membrane? - ANSWER- it is the site for signal transduction, it is a selectively permeable barrier
The _______________ is surrounded by an envalope and contains the genetic material (DNA) of a cell. - ANSWER- n...
Cells APHY101 Exam Questions With
Marking Scheme
What are two functions of the cell membrane? - ANSWER- it is the site for signal
transduction, it is a selectively permeable barrier
The _______________ is surrounded by an envalope and contains the genetic material
(DNA) of a cell. - ANSWER- nucleus
TRUE or FALSE: When molecules move down a concentration gradient, it means that
there is a net movement pf particles from a region of lower concentration to a region of
higher concentration. - ANSWER- false
MITOSIS in order - ANSWER- prophase, metaphase, anaphase, telophase
OSMOSIS is the diffusion of _____________. - ANSWER- water
What are forces that drive ACTIVE TRANSPORT? - ANSWER- ATP and cellular energy
What TWO conditions are necessary for diffusion of a substance to occur across a
membrane? - ANSWER- membrane permeability; a concentration gradient
The term __________________ refere to the difference in concentration between two
regions. - ANSWER- gradient
What structures function to move mucus across the surface of the cell? - ANSWER-
cilia
Which organelle is composed of a stack of 5-8 flattened, membranous sacs called
cisternae? - ANSWER- golgi apparatus
Describe an increased rate of diffusion (3 things). - ANSWER- larger concentration
gradient, shorter distance, higher temperature
Describe a decreased rated of diffusion (3 things). - ANSWER- smaller concentration
gradient, longer distance, lower temperature
Simple ________________ occurs due to the random movement(s) of atoms,
molecules, or ions in air or liquid, from areas of higher concentration to areas of lower
concentrations. - ANSWER- diffusion
IMPORTANT: What occurs during PROPHASE? - ANSWER- the nucleus and nucleolus
disappear, chromatin coils up into chromosomes, spindle fibers form
, In _____________________, substances are moved across a membrane, against their
concentration gradients. - ANSWER- active transport
Organelles called transport ________________ are membranous sacs containing
substances that were produced in the cell like neurotransmitters or hormones. -
ANSWER- vesicles
IMPORTANT: Which organelle has enzymes necessary for lipid synthesis and
metabolism of drugs? - ANSWER- smooth endoplasmic reticulum
The type of endocytosis in which a cell membrane engulfs solid particle(s) from its
surroundings is called _________________________. - ANSWER- phagocytosis
Give FOUR characteristics of the endoplasmic reticulum. - ANSWER- functions in
synthesis of lipids, provides attachment for ribosomes, composed of membranous sacs,
functions in synthesis of proteins (RER)
TRUE or FALSE: Both facilitated diffusion and simple diffusion require NO carrier to
move molecules across the membrane. - ANSWER- false
THREE things that describe facilitated diffusion. - ANSWER- passive process, does not
require energy, moves molecules from high concentrations to low concentration ares
THREE things that describe active transport. - ANSWER- active process, requires
energy, moves molecules from low to high concentration areas
Active transport - ANSWER- Energy-requiring process that moves material across a cell
membrane against a concentration difference
Exocytosis - ANSWER- the process by which a cell releases its content from a vesicle
to the outside of the cell
Endocytosis - ANSWER- process by which a cell takes material into the cell with the
use of a vesicle
Osmosis - ANSWER- movement of water through a selectively permeable membrane
towards a solution with a greater osmotic pressure
Diffusion - ANSWER- movement of molecules from an area of higher concentration to
an area of lower concentration
Ions that use specific protein channels in the membrane use a process called
_______________ to move down their concentration gradient across the plasma
membrane. - ANSWER- facilitated diffusion
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