a protective barrier for the cell: allows the transport of needed materials into the cell and waste materials out; is important for cell interaction and communication, and for recognition of molecules
the organelle that contains DNA, the genetic material of the cell, and directs all cellular activities.
surrounds the nucleus, has pores to allow the transport of materials
a gel-like substance inside the cell membrane: contains the nutrients required by the cell to carry on the life processses. the organelles are suspended in the substance. allows for the movement of organelles and molecules within the cell
Which has a cell wall?
a) animal cells
b) plant cells
b) plant cells
a rigid frame around the cell that provides strength and support
found only in plants and some protists. sites of photosynthesis, contain chlorophyll that produces a green color
membrane-bound structures that serve to store nutrients, products of secretion, and fats, depending on the tissue type. un plants, it stores water for the cell and increases the turgor pressure, causing the cell to become firm or turgid.
a series of interconnected small tubes that branch from the nuclear envelope. materials can be transported through these tubes.
has ribosomes attatched to it and is associated with protein synthesis
rough endoplasmic reticulum
associated with fat and oil production
smooth endoplasmic reticulum
all the cell organelles, except the _________ are enclosed by a membrane
all the cell organelles, except the ribosomes are enclosed by a membrane
dense looking granules formed of two parts. they may be attatched to the endoplasmic reticulum or free in the cytoplasm. the sites where amino acids are assembled into proteins in the process of protein synthesis
membrane-bound sacs in the cell in which digestion can go on. the various roles of these include defense against invading bacteria, destruction of damaged cell organelles, and controlled digestion of certain tissues during development.
composed of flat, disc-shaped sacs involved in secretion. revieves substances from the endoplasmic reticulum and packages them for transport out of the cell.
rod-like structures where reactions occur to convert chemical energy in sugars into energy the cell can use. this process is called cellular respiration.