Ch.6 A tour of the cell

The endosymbiont theory explains the origins of __________.

mitochondria and chloroplasts

The extracellular matrix of the animal cell has all of the following molecular components except ....

A middle lamella

Which of the following choices matches a tool and it's proper application?

Cell fractionation to study the function of specific organelles.

The organelle that is a plant cell's compartment for the storage of inorganic ions such as potassium and chloride is the __________.

Central vacuole

Which of the following is false in respect of cells' chromosomes?

Chromosomes are only visible as a cell is about to divide

Which statement about the cytoskeleton is true?

Components of the cytoskeleton often mediate the movement of organelles within the cytoplasm.

In terms of cellular function, what is the most important difference between prokaryotic and eukaryotic cells?

Eukaryotic cells are compartmentalized, which allows for specialization.

A protein that ultimately functions in the plasma membrane of a cell is most likely to have been synthesized __________.

In the rough ER

The walls of plant cells are largely composed of polysaccharides and proteins that are synthesized.....

In the rough endoplasmic reticulum and in the Golgi apparatus.

The network of fibers that organizes structures and activities in a cell.....

Is the cytoskeleton

Cilia and flagella move due to the interaction of the cytoskeleton with which of the e following?

Motor proteins

The endoplasmic reticulum is part of the endomembrane system , which also include the ......

Nuclear envelope, the Golgi apparatus, lysosomes, vesicles

The region of a bacterial cell that contains the genetic material is called the __________.

Nucleoid

....... Are membrane bound metabolic compartments that specialize in the production of hydrogen peroxide and it's conversion to water.

Peroxisomes

Which of the following groups is primarily involved in synthesizing molecules needed by the cell?

Ribosomes, rough endoplasmic reticulum, and smooth endoplasmic reticulum

What is the functional connection between the nucleolus, nuclear pores, and the nuclear membrane?

Subunits of ribosomes are assembled in the nucleolus and pass through the nuclear membrane via the nuclear pores.

Evidence that supports the prokaryotic origins of mitochondria and chloroplasts are all of the following except .....

That mitochondria and chloroplasts have multiple copies of linear DNA molecules associated with their inner membranes.

Your intestine is lined with individual cells. No fluids leak between these cells from the gut into your body. Why?

The intestinal cells are bound together by tight junctions.

Animal cells have unique organelles called __________ that are composed of structures called __________.

centrosomes; centrioles

Basal bodies are most closely associated with which of the following cell components?

cilia

Bacterial cells are prokaryotic. Unlike a typical eukaryotic cell they __________.

have no membrane-bounded organelles in their cytoplasm

Observing a fluorescent micrograph cell with intermediate filaments would help you identify the cell as a __________.

human skin cell

Microfilaments function in cell motility including ____.

muscle contraction, amoeboid movement, and cytoplasmic streaming in plants

Cells are small because

of the geometric relationships between surface and volume

A substance moving from outside the cell into the cytoplasm must pass through __________.

plasma membrane

Dye injected into a plant cell might be able to enter an adjacent cell through __________.

plasmodesmata

Cell junctions in plant cells are called __________, and communicating junctions in animal cells are called __________.

plasmodesmata; gap junctions

Which of the following is present in a prokaryotic cell?

ribosome

You would expect a cell with an extensive Golgi apparatus to __________.

secrete a lot of protein

The function of the rough endoplasmic reticulum (RER) is __________.

to synthesize proteins that are secreted as glycoproteins

Beginning within the nucleus, the first step leading to the synthesis of a polypeptide is _____.

transferring of information from DNA to messenger RNA

Cell motility, which includes changes both in cell location and in the movement of cell parts, requires interactions of the cytoskeleton __________.

with motor proteins