A & P chapter 3

Which of the following statements about cells is FALSE? View Available Hint(s) Cells join together to form organelles, which then form our organs and organ systems. Cells are the most basic units of life. Although human cells are diverse in size, shape, and function, they have essentially the same organelles and general structure. The cells in our bodies collectively carry out all of the functions necessary for us to stay alive.

Cells join together to form organelles, which then form our organs and organ systems.

Part complete What is the basic difference between simple diffusion and facilitated diffusion across a cell membrane? View Available Hint(s) Simple diffusion is passive but facilitated diffusion is an active process that uses energy. In facilitated diffusion, molecules only move with the aid of a protein in the membrane. Simple diffusion requires molecules to move through special doorways in the cell membrane. In simple diffusion, molecules move down the concentration gradient but in facilitated diffusion molecules move up the concentration gradient.

In facilitated diffusion, molecules only move with the aid of a protein in the membrane.

Which of the following is most likely to move through the cell membrane by facilitated diffusion? View Available Hint(s) Na+ small lipids CO2 O2

Na+

Part complete Why is the selective permeability of the plasma membrane essential for normal cell function? Selective permeability allows cells to communicate with each other by sharing large and small molecules. Selective permeability allows cells to exclude some substances and allow others to pass into or out of the cell. Selective permeability allows cells to determine which proteins they should produce and retain. Selective permeability allows cells to bind to one another in a fluid environment.

Selective permeability allows cells to exclude some substances and allow others to pass into or out of the cell.

What is the primary function of the mitochondria? They are the primary sites of protein production in a cell. They build cholesterol. They are the main sites of photosynthesis. They are the main sites of ATP production.

They are the main sites of ATP production.

Which of the following is characteristic of cilia? They are substantially longer than flagella, and are most easily seen in human sperm cells. They are used for cellular adhesion. They move substances in any direction across cell surfaces. They are whiplike, motile cellular extensions that occur in large numbers on the exposed surfaces of certain cells.

They are whiplike, motile cellular extensions that occur in large numbers on the exposed surfaces of certain cells.

The figure is of which cellular organelle?

a mitochondrion

Peroxisomes ________. are able to detoxify substances by enzymatic action sometimes function as secretory vesicles function to digest particles ingested by endocytosis are also called microbodies, and contain acid hydrolases

are able to detoxify substances by enzymatic action

Which cell component helps to maintain the structural integrity of the cell? centriole cytoskeleton ribosome peroxisome

cytoskeleton

A vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid. This statement describes _____. View Available Hint(s) endocytosis facilitated diffusion simple diffusion active transport exocytosis

exocytosis

Some transport processes use transport proteins in the plasma membrane, but do not require ATP. This type of transport is known as _____. View Available Hint(s) simple diffusion exocytosis facilitated diffusion endocytosis active transport

facilitated diffusion

The majority of water molecules moving across plasma membranes by osmosis do so via a process that is most similar to ____. View Available Hint(s) a process that requires energy from the cell cotransport simple diffusion active transport facilitated diffusion

facilitated diffusion

Phagocytosis is a form of exocytosis. True False

false

Which of the following would NOT diffuse through the plasma membrane by means of simple diffusion? a lipid soluble vitamin oxygen a steroid hormone glucose

glucose

Solutions with a higher concentration of solutes than the concentration inside the cells are __________. hypoosmotic hypertonic isotonic hypotonic

hypertonic

Where in a typical eukaryotic cell would you expect to find genes? View Available Hint(s) in chromosomes within the cytosol in the DNA within the cell's nucleus in the chromatin within the cell's cytoplasm in the nucleolus within the nucleus

in the DNA within the cell's nucleus

Which of the following acts as the digestive system of the cell, breaking down materials? View Available Hint(s) endoplasmic reticulum nucleus ribosome lysosome

lysosome

Which of the following is a function of a plasma membrane protein? oxygen transport circulating antibody forms a lipid bilayer molecular transport through the membrane

molecular transport through the membrane

Part complete A primary active transport process is one in which __________. View Available Hint(s) molecules move across the plasma membrane without an input of energy the plasma membrane folds inward to form a vesicle containing extracellular material an intracellular vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid molecules move through transport proteins that have been activated by ATP molecules pass directly through the phospholipid bilayer of the plasma membrane

molecules move through transport proteins that have been activated by ATP

Passive membrane transport processes include ________. movement of a substance down its concentration gradient consumption of ATP movement of water from an area of high solute concentration to an area of low concentration the use of transport proteins when moving substances from areas of low to high concentration

movement of a substance down its concentration gradient

Which of the following best explains diffusion? View Available Hint(s) movement of molecules from where there are fewer of them to where there are more exchange of nonpolar molecules for polar molecules movement of molecules farther away from equilibrium movement of molecules from an area of high concentration to an area of low concentration

movement of molecules from an area of high concentration to an area of low concentration

Which mechanism requires energy input by the cell in the form of ATP hydrolysis?

none of the mechanisms require energy input

The functions of centrioles include ________. serving as the site for ribosomal RNA synthesis producing ATP providing a whiplike beating motion to move substances along cell surfaces organizing the mitotic spindle in cell division

organizing the mitotic spindle in cell division

The plasma membrane is made primarily of ________. water nucleic acids phospholipids amino acids

phospholipids

The sodium-potassium pump uses ATP to move sodium and potassium ions across the plasma membrane. This statement describes _____. View Available Hint(s) facilitated diffusion primary active transport exocytosis secondary active transport simple diffusion

primary active transport

Which of the following is NOT one of the three major components of a typical eukaryotic cell? View Available Hint(s) cytoplasm ribosome nucleus plasma membrane

ribosome

Which organelle is responsible for synthesizing proteins? smooth endoplasmic reticulum mitochondria ribosomes Golgi apparatus

ribosomes

Which of the following is least likely to increase the rate of diffusion? View Available Hint(s) small molecule size high temperature higher concentration of molecules small concentration gradient

small concentration gradien

Diffusion movement always occurs from areas of greater to areas of lesser concentration. True False

true

Lysosomes perform digestive functions within a cell. True False

true