Biology 1:3-1
All organisms are made up of one or more _____________.
cells
________________ cells have no nucleus.
prokaryotic
cell without a nucleus that is found in single-celled organisms
prokaryotic cell
organelle inside all cells where proteins are made
ribosome
Organelle where proteins are made
ribosomes
Proteins are made on the ____________.
ribosomes
The first microscopes were invented around
1665
_________ is the genetic instructions that cells need to make proteins.
DNA
The first person to use the word "cell"
Hooke
This scientist discovered human blood cells
Leeuwenhoek
Robert Hooke first observed cells, where did he observe these cells.
a piece of cork
The cell theory states that
all organisms are made of cells, all cells come from existing cells, all life functions occur within cells
The spikes on pollen grains probably
allow the pollen grains to stick to insects
A ________________ is a typical prokaryotic cell.
bacteria
Leeuwenhoek discovered _________ by looking at the plaque from his own teeth.
bacteria
The material inside the plasma membrane of a cell.
cytoplasm
all of the material inside the plasma membrane of a cell (excluding organelles)
cytoplasm
All cells have certain parts in common, including a plasma membrane, __________________ , ___________________ , and DNA
cytoplasm, ribosomes
organism that has cells containing a nucleus and other organelles
eukaryote
Organism that has cells containing a nucleus and other organelles.
eukaryotic
cell that contains a nucleus and other organelles
eukaryotic cell
A major difference between prokaryotic and eukaryotic cells is that
eukaryotic have a nucleus
______________ cells are usually larger than __________________ cells.
eukaryotic, prokaryotic
A virus is very similar to a prokaryotic cell.
false
Cells were first observed in a sample of pond water.
false
Early microscopes created by Leeuwenhoek were very weak compared to todays light microscopes.
false
Most cells are about the size of the period at the end of this sentence.
false
Prokaryotic cells have a nucleus.
false
The larger a cell is the more efficient it is.
false
Viruses are living organisms.
false
A cell's shape is generally related to the cell's______________.
function
Organelles in prokaryotic cells include the
no organelles in a prokaryotic cell
An organelle inside a eukaryotic cell where the DNA is located
nucleus
In a eukaryotic cell, DNA is found in the _____________.
nucleus
organelle inside eukaryotic cells that contains most of the cell's DNA and acts as the control center of the cell
nucleus
A structure within the cytoplasm of a cell that is enclosed within a membrane and performs a specific job.
organelle
structure within the cytoplasm of a cell that is enclosed within a membrane and performs a specific job
organelle
The plasma membrane is a bilayer of _______________ that surrounds a cell.
phospholipids
This is composed of a phospholipid bilayer and makes up the "skin" of the cell.
plasma membrane
thin coat of lipids (phospholipids) that surrounds and encloses a cell
plasma membrane
All cells have the following parts in common
plasma membrane, cytoplasm, ribosomes, DNA
A cell without a nucleus.
prokaryote
single-celled organism that lacks a nucleus
prokaryote
Cell size is limited by
the cells ability to rid itself of waste
All cells have a plasma membrane, cytoplasm, and ribosomes.
true
All organisms are made of at least one cell.
true
Compared to prokaryotic cells, Eukaryotic cells are more complex.
true
DNA is located in the nucleus of prokaryotic cells.
true
Organelles are found within the cytoplasm.
true
Proteins are made on ribosomes.
true
The plasma membrane forms the boundary between the cell's internal and external environment.
true
tiny, nonliving particle that contains DNA but lacks other characteristics of living cells
virus
____________ contain DNA, but no cytoplasm or ribosomes.
viruses
tiny non-living particles that may cause disease
viruses