CH. 3 Cell Structure and Function
selectively permeable
"Some molecules pass" best describes the property of ___________ _________.
rough endoplasmic reticulum
"Studded with ribosomes" is a phrase which best describes _____ ___________ _________.
ligands
A _______ produces a response in a cell if it finds the right kind of receptor.
phosopholipid
A ______________ is composed of a polar head and a non-polar tail.
vesicle
A membrane-bound sac used to transport substances into and out of cells is a _______.
receptor
A protein that detects a signal molecule and performs an action in response is called a ________.
hypotonic
A solution that is _________.
exocytosis
A vesicle fuses to the cell membrane and its contents leave the cell describes what?
transport protein
Cells use active _________ _______ to obtain molecules they need.
organelles
Specialized structures that work together inside a cell are called __________.
All existing cells are made from living cells.
The cell theory states that all organisms are made of cells; cells are the most basic unit of life; and _____________________________________________.
concentration gradient
The difference in the concentration of dissolved particles from one location to another is called a _____________ ________.
facilitated diffusion
The movement of molecules down a concentration gradient through transport proteins in the cell membrane is a type of ___________ _________.
nucleus
Unlike a eukaryotic cell, a prokaryotic cell does not have a _______.
hypotonic
Water moves into a cell when the solution surrounding the cell is _________.
osmosis
What is the term for the diffusion of water across a semipermeable membrane?
cytoplasm
What is the term for the jellylike substance that is contained inside the cell membrane?
cytoskeleton
What makes a network of proteins that supports and gives shape to a cell?
Golgi body
What organelle's main function is to process and deliver proteins?
cell wall & chloroplasts
What two things do plant cells have that animals cells do not have?
microscope
Which invention played the biggest role in the discovery of cells by early scientists?
fluid mosaic model
Which model did scientists develop to describe the cell membrane?
ribosomes
Which organelle can be found in the cytoplasm and on the surface of the endoplasmic reticulum?
lysosome
Which organelle contains enzymes that break down damaged cell parts?
nucleus
Which organelle is the storehouse for most of a cell's genetic information?
lysosomes
Which organelles are involved in defending a cell against viruses?
vesicles
Which organelles are involved in the process called endocytosis?
mitochondria
Which organelles supply energy to the cell?
exocytosis
Which process is occurring when a vesicle fuses with the cell membrane and releases its contents outside the cell?
photosynthesis
Which process occurs inside the chloroplasts?
active transport
Which process uses proteins to move molecules against a concentration gradient?
Passive
_______ transport requires no energy from the cell.