Biology mid-term 2

Question Answer
placing wilted lettuce in cold water will make it crisp again. which statement best describes what happens to restore the lettuce to its original condition? water entered the cells of the lettuce through osmosis
when a plant cell is placed in a solution, it shrinks. what does this tell you about the solution? it is hypertonic
what is osmosis? diffusion of water through a semi-permeable membrane
when a molecule moves to become more spaced out from other molecules this is knows as its diffusion
when the concentration of solute outside the cell is equal to the concentration of solute inside it is isotonic
which best describes a concentration gradient?
in an isotonic solution… the solution inside and outside of the cell are at equilibrium
if water is moving into a cell, this is known as ________ solution. Hypotonic
when molecules move from one side of the cell membrane to the other down their concentration gradient without assistance from a protein, this is knows as
elodea, a freshwater plant, is being viewed under a microscope. Which would most likely occur if salt water were placed on the cells? the cells would shrink
which of the following can be described as moving large amounts of waste out of the cell by using the cel membrane? exocytosis
a sodium-potassium protein pump within a cell membrane requires energy to move sodium and potassium ions into or out of a cell. the movement of active transport, and glucose moved by facilitated diffusion
which of the following best describes facilitated transport? movement of large molecules down their concentration gradient that require a protein
what part of the cell make proteins? ribosomes
which of the following is found in plant cells, but not in animal cells? cell wall
the nuclear envelope is double membrane of the nucleus
if you looked through a microscope at a cell and saw a nucleus, mitochondria, chloroplasts and a cell wall, what type of cell would you be looking at? plant cell
region of a prokaryotic cell that contains DNA without a membrane nucleoid
energy processing structure that carries out a cellular respiration mitochondira
extensive network with passageways to carry proteins and other materials from one part of the cell to another endoplasmic reticulum
large vesicles that are used for storage of food, water and other materials vacuole
sacs of digestive enzymes that break down food and worn cell parts lysosomes
energy processing structure that carries out photosynthesis chloroplasts
membrane bound organelle that contains DNA and acts as the control center of the cell nucleus
carbon dioxide and oxygen are molecules that can move freely across a plasma membrane. what determines the direction that carbon dioxide and oxygen move? concentration gradient
which of the following statements best describes the fluid mosaic model of the plasma membrane? a protein bilayer sandwiching a layer of lipids
a substance that moves by passive transport tends to move away from the area where it is more concentrated
which type of membrane transport process uses energy (ATP)? active transport
an animal cell that is surrounded by fresh water will burst because the osmotic pressures causes.. water to move into the cell
what are the channels and pumps contained within the cell membrane are made of? lipids

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