Bio Chapter 4- IWCC
Which of the following statements is not part of the cell theory?
All cells are surrounded by a cell wall.
What are the tenets of cell theory?
All living cells arise by division of preexisting cells, Every living organism consists of one or more cells, and Cells are individually alive and are the basic structural and functional units of life.
Which of the following is a property of life that viruses lack?
Engages in self-sustaining biological processes such as homeostasis and metabolism
What features of mitochondria are similar to bacteria?
Independent movement, Circular DNA similar to plasmids and Membrane-bound ribosomes
hat properties define the phospholipids that make up the lipid bilayer?
Nonpolar, hydrophobic hydrocarbon tails and Polar, hydrophilic phosphate heads
Which of these structures is not an example of an extracellular matrix?
Nuclear envelope
What cellular structure contains the DNA?
Nucleus
Which of the following characteristics is specific to prokaryotic cells?
Plasmids
Which of these cell junctions are open channels that connect the cytoplasm of adjoining plant cells?
Plasmodesmata
Which of the following are the only molecules built by ribosomes and rough endoplasmic reticulum (RER)?
Proteins
What kind of membrane proteins trigger a change in cellular activity in response to a stimulus?
Receptor proteins
The plasma membrane is considered a fluid mosaic because it permits incorporated molecules such as receptors and transport proteins to _____.
move around laterally within the membrane
On average, eukaryotic cells are approximately _____ prokaryotic cells.
10 times larger than
What is a microfilament?
A cytoskeletal element made of actin that reinforces cell membranes and functions in cell movement
What structure allows only certain molecules to pass into or out of the cell?
Cell membrane
What distinguishes archaea from bacteria?
Cell wall composition and Lack of an external capsule
Which structures occur only in eukaryotic cells?
Golgi bodies and Endoplasmic reticulum
What part of a phospholipid faces the cytosol inside a cell?
Hydrophilic head
Which functions are carried out by smooth endoplasmic reticulum?
Makes phospholipids and stores calcium
What features are a part of all cells?
Ribosomes, DNA, Cytosol, Plasma membrane
What are components of the fluid mosaic model of the cell membrane?
The cell membrane is a lipid bilayer with molecules such as cholesterol and proteins embedded in it.
Which type of microscopy allows us to clearly view the internal contents of cell structures smaller than 200 nm?
Transmission electron microscopy
What are the functions of the nuclear pores?
Transport RNA from the nucleus to the cytoplasm for protein synthesis and transport proteins from the cytoplasm to the nucleus for RNA synthesis
Mitochondria are an example of _____.
organelles found within eukaryotic cells
Ions and polar molecules can cross the plasma membrane in regions where the membrane has incorporated _____.
transport proteins
