Chapter 5
which one of the following molecules is able to move across the cell membrane by simple diffusion
carbon dioxide
molecules move from higher to lower concentration through a transport protein
facilitated diffusion
cytoplasm - shrinks blood cell - shrivels
hypertonic
enzymes are able to speed up the rate of a reaction by
lowering the energy needed for the reaction to proceed
the diffusion of water and a semi-permeable membrane
osmosis
regulation of the enzymes involved in metabolic reactions usually requires
feedback inhibition
which of the following is not a mechanism used to move materials in and out of the cell
feedback inhibition
simple diffusion of molecules occurs
from an area of higher concentration to an area of lower concentration
simple diffusion across a plasma membrane is called passive transport because it
doesn't require energy from the cell
which of the following molecules would have the most potential energy to perform work for cell activities - AMP - ATP - adenosine - ADP
ATP
Which of these words does not belong with the rest as it relates to - concentration gradient? - passive transport - facilitated diffusion - diffusion - active transport
active transport
the concentration of calcium in a cell is 3%. the concentration of calcium in the surrounding fluid is 1%. how could the cell obtain more calcium.
active transport
which of the following is an example of osmosis - Glucose is transported from our blood stream across cell membranes and into the cytoplasm. - Cells of our kidneys reabsorb water to prevent it from all leaving through our urine. - Sodium is pumped across a cell to increase its concentration on one side of the cell membrane. - A broken bottle of perfume is able to be smelled throughout the department store. - A bacterium in the blood stream is engulfed by a white blood cell.
cells of our kidneys reabsorb water to prevent it from all leaving through our urine
probable factors that affect the passage of materials across the cell membranes include all of the following EXCEPT
color
because it is a passive process, which membrane transport process can continue whether the cell is alive or dead
diffusion
entropy is best described as
disorder
why do metabolic pathways require tens to hundreds of different enzymes
each enzyme has a specific substrate and produces a specific product
metabolic pathways are known for all of the following except - feedback inhibition - enzymes to help raise the energy of activation - linking between pathways - controlled formation of products
enzymes to help raise the energy of activation
when a cell is in a solution where the concentration of solute is the same in the cell as in the solution, the solution is called
isotonic
if blood cells are placed in a hypotonic solution
the cells will shrink due to water loss by the cell
When a potted house plant is wilting, the addition of water quickly changes the look of the plant. This can be accounted for by
the water creates a hypotonic environment causing the cells to gain water
in feedback inhibition of a metabolic pathway, where does the inhibitor bind?
to the enzyme of the first reaction
Identify which of the following statements is not true. - ATP contains the energy form used for cellular work. - ATP is formed when energy is released during cell respiration. - When ATP becomes ADP + P, the amount of energy released is enough for a biological purpose. - ATP is comprised of a sugar, base, and two phosphate groups.
ATP is comprised of a sugar, base, and two phosphate groups
Which of the following examples does NOT describe kinetic energy? - a firefly using light flashes to attract a mate - an apple made up of energy-rich macromolecules - a candle giving off light - a pile of leaves that have been burnt
an apple made up of energy-rich macromolecules
what prevents a plant cell from bursting in a hypotonic solution
cell wall
