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The __________________ helps cells maintain homeostasis because it controls what enters and leaves the cell.
cell membrane
cell wall
lysosomes
nucleus
Diffusion moves molecules from areas of ______ concentration to areas of ______ concentration.
high, low
The cells of all organisms contain DNA. In cells of which of the following groups is the cellular DNA enclosed in a nucleus?
Prokaryotes
Viruses
Bacteria
Eukaryotes
The ___________ is the structure that provides the site for making proteins.
ribosome
________________ is the diffusion of water and it is a form of __________ transport.
osmosis, passive
________________ is a type of endocytosis and is considered to be “cellular eating.”
Phagocytosis
Exocytosis
Pinocytosis
Diffusion
______________ transport does not require cellular energy to occur.
Passive
Which type of organism consists of specialized cells?
unicellular prokaryotes
unicellular eukaryotes
multicellular prokaryotes
multicellular eukaryotes
Diffusion is a process that _________________________.
does not require energy to occur
requires energy to occur
Active transport ______________ energy to occur because particles move __________ the concentration gradient.
requires, with
does not require, against
does not require, with
requires, against
According to the cell theory, all cells come from _________________.
pre-existing cells
The ____________________ gives cell membranes a flexible structure that forms a strong barrier between the cell and its surroundings.
lipid bilayer
If a cell contains a nucleus, it must be a(n) ____________________.
eukaryote
Which organelle is found in plant cells but NOT in animal cells?
chloroplast
mitochondrai
golgi bodies
cytoplasm
Which of the following is NOT an example of a type of solution?
isotonic
isometric
hypertonic
hypotonic
The movement of materials into and out of the cells is controlled by the ___________________.
cell membrane
