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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 |
Created by:
Reese1201