Everything deck :) Flashcards
(35 cards)
When were microsopes used to discover cells
In 1665, early microscopes were used to look at cork discovered tiny boxes, called “cells”
What is the cell theory?
- All living things are made of cells
- Cells are the simplest units of living things
- All cells come from existing cells through cell
division
What is a prokaryotic
Prokaryotic: bacteria
Missing a nucleus and any membrane organelle
DNA hangs out in nucleoid
What is a Eukaryotic
Eukaryotic: every other cell
Has all organelles
Includes all other living things
Cell Specialization
The shape of cells is directly related to their function
Examples:
Skin cells are flat and fit together tightly
Function: cover tissue and waterproofing
Nerve cells are long and thin
Function: transmit a signal long distances
Blood cells are thin and flexible
Function: carry oxygen and get everywhere in body
Cytoplasm:
—everything
except the nucleus
Cytosol
fluid that fills
the cells between
organelles
What is unicellular
also known as a single-celled organism, is an organism that consists of a single cell,
What is Multicellular
is an organism that consists of more than one cell
Organelle
Organelles are specialized structures that perform various jobs inside cells. The term literally means “little organs.” –organelles serve specific functions to keep a cell alive–
EX- lysosomes, nucleus , mitochondria , and the endoplasmic reticulum .
What is a Cell Membrane
is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer
The cell membrane regulates the transport of materials entering and exiting the cell.
Lipid bilayer
A bilayer is composed of two sheets of phospholipid molecules each having a head and two tails
its structural components provide the barrier that marks the boundaries of a cell.
The inside of the lipid bilayer is non-polar, while the heads are polar molecules and create hydrogen bonds with other polar molecules.
Phospolipids
also known as phosphatides, are a class of lipids whose molecule has a hydrophilic “head” containing a phosphate group, and two hydrophobic “tails”
Hydrophobic
tending to repel or fail to mix with water.
Hydrophilic
having a tendency to mix with, dissolve in water
Cell Wall
a structural layer surrounding some types of cells, Mainly plant cells
it protects the cell
The primary wall
To allow for cell wall expansion during growth, primary walls are thinner and less rigid than those of cells that have stopped growing.
secondary cell wall
Found in plant cells—located between the primary cell wall and the plasma membrane. The cell starts producing the secondary cell wall after the primary cell wall is complete and the cell has stopped expanding.
Nucleus
A nucleus is a membrane-bound organelle that contains the cell’s chromosomes.
Nucleolus
whose main function is ribosomal synthesis and ribosome biogenesis.
its a darker dot in the nucleus
Nucleoid
an irregularly shaped area containing the genetic material of the prokaryotic cell.
ONLY IN BACTERIA
Mitochondria
A mitochondrion is a double-membrane-bound organelle found in most eukaryotic organisms. —Responsible for orchestrating cellular energy production
Ribosome
Ribosomes link amino acids together specified by the messenger RNA———–that perform biological protein synthesis.
Golgi Apparatus
is a cell organelle that helps process and package proteins and lipid molecules, especially proteins destined to be exported from the cell.