Biology 123 CHAPTER 6
Animals cells have unique organelles called_______ that are composed of structures called______
1. Centrosomes 2.centrioles
Basal bodies are most closely associated with which of the following cell components?
cilia
The network of fibers that organizes structures and activities in a cell __________.
cytoskeleton
Observing a fluorescent micrograph cell with intermediate filaments would help you identify the cell as a __________.
human skin Cell
Your intestine is lined with individual cells. No fluids leak between these cells from the gut into your body. Why?
intestinal cells are bound together by tight juntions.
Cell motility, which includes changes both in cell location and in the movement of cell parts, requires interactions of the cytoskeleton __________.
motor proteins
Cilia and flagella move due to the interaction of the cytoskeleton with?
motor proteins
Microfilaments function in cell motility including
muscle contraction, amoeboid movement and cytoplasmic streaming in plants.
what is the functional connection between the nucleolus, nuclear pores and nuclear membrane?
subunits of ribosomes are assembled in the nucleolus pass through the nuclear membrane via nuclear pores.
The function of the rough endoplasmic reticulum is
synthesize protein that are secreted by glycoproteins
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 to cells chromosomes?
Chromosomes are only visible as a cell is about to divide.
what is true about the cytoskeleton
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
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 extracellular matrix of the animal cell has all of the following expect
a middle lamella
The endosymbiont theory explains the origins of __________.
mitochondria and chloroplasts
evidence that supports the prokaryotic origins of mitochondria and chloroplasts are all the following expect
mitochondria and chloroplasts have multiple copies of linear DNA molecules associated with their inner membranes
the endoplasmic reticulum is part of the endomembrane system which also includes
nuclear envelope. golgi apparatus, lysosomes and vesicles
The region of a bacterial cell that contains the genetic material is called the __________.
nucleoid
Cells are small because
of the geometric relationships between surface and volume
__________ are membrane-bound metabolic compartments that specialize in the production of hydrogen peroxide (H2O2) and its conversion to water.
peroxisomes
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 juntions in plant cells are called _____ and communication junctions in animal cells are called _______
plasmodesmata: gap junctions
Which of the following is present in a prokaryotic cell
ribosomes
which of the following groups is primarily involved in synthesizing molecules needed by the cell?
ribosomes, rough endoplasmic reticulum, and smooth endoplasmic reticulum
A protein that ultimately functions in the plasma membrane of a cell is most likely to have been synthesized __________.
rough endoplasmic reticulum.
Bacterial cells are prokaryotic. Unlike a typical eukaryotic cell they __________.
they have NO membrane-bound organelles in their cytoplasm
You would expect a cell with an extensive Golgi apparatus to __________.
to secrete a lot of protein
