cell types & theory
cells that lack membrane-bound organelles and a true nucleus.
what are prokaryotic cells
jelly-like substance that takes up space and holds organelles in place.
what is cytoplasm
this term describes the ability of the plasma membrane to regulate the passage of substances
what is selective permeability
phospholipids are classified under this category of biological macromolecules
what are lipids
externa, part of most prokaryotic cells and some eukaryotic cells, important for cell structure and shape
what is the cell wall
concept states that all living organisms are composed of cells.
what is cell theory
these catalyze the synthesis of proteins and can float freely or attach to the ER
what is ribosomes
this passive transport process moves solute down a concentration gradient via transport proteins
what is facilitated diffusion
these two types of nucleic acids found in cells
DNA and RNA
found in eukaryotic cells but not all. come from the centrosome, involved with cell division
what are centrioles
This structure is found in both prokaryotic and eukaryotic cells and maintains homeostasis.
what is the plasma membrane
this organelle modifies, sorts, and packages proteins.
what is the golgi apparatus
this transport mechanism involves ATP and a carrier protein to move substances against a gradient
what is active transport
these protein fibers provide mechanical support and facilitate intracellular transport
what is the cytoskeleton
found in some eukaryotic cells and contains enzymes that can break down substances
what is lysosomes
The nucleoid region, circular DNA, and small ribosomes are characteristic of
this
what is bacteria
These organelles contain thylakoid membranes and carry out photosynthesis.
what are chloroplasts
form of passive transport, small nonpolar molecules like oxygen and carbon dioxide move directly through the membrane
what is simple diffusion
RNA differs from DNA because it contains this sugar and this nitrogenous base
what is ribose and uracil
found in eukaryotic cells, houses the cells and controls the cell’s activities
what is the nucleus
these structures increase surface area in cells specialized for absorption.
what are microvilli
This network of membranous tubules is involved in lipid synthesis and detoxification
what is the smooth ER
the fluid mosaic model that describes this particular structure composed of phospholipids and proteins
what is the cell membrane
used in chemical reactions without being consumed
what are catalysts
found in eukaryotic cells and stores materials depending on the cell type
what is the vacuole