chapter 3 hw

The complimentary messenger RNA strand that would be synthesized from the DNA base sequence of CTGAC would be - GACTG - UGACU - AGTUG - GACUG - GACGU

GACUG

describe gap junctions

allow the passage of ions from one cell to another, allow electrical stimulation to pass from cell to cell, formed by a ring of six proteins surrounding a water-filled channel

describe desmosomes

contributes to the cytoskeleton, prevents cells from being pulled apart, hook-like-j shaped protein connect to one another but do not create a water-tight seal, the hemi-version prevents cells from being pulled from the basement membrane

describe inclusion

phagocytized backterium, glycogen, lipid droplet, non membrane-enclosed

the opening of ligand-gated sodium ion channels causes - a ligand to be formed - the sodium channels to open - the sodium channels to close - sodium ions to diffuse through and enter the cell - sodium ions to diffuse through and leave the cell

sodium ions to diffuse through and enter the cell

The name of the structure that causes the synthesis of RNA to cease is called the - promoter region - sigma factor - transcription terminator - polymerase - template

transcription terminator

Osmosis can be described as both the diffusion of a liquid from an area of high concentration of that liquid to an area of a low concentration of that liquid, and, as the diffusion of a liquid from a low concentration of solutes to an area of high concentration of solutes. true or false

true

describe microvilli

used for absorption, increases the surface area of the cell, contain the brush border enzymes of the intestines

describe nonmotile "primary" cilia

used for sensation, located in the inner ear, nasal cavity, and retina as sensory receptors

describe motile cilia

used to move fluids on outer surface of the cell, utilizes rhythmic movement, utilizes ATP for movement, contains molecule motors

describe organelle

workhouse of the cell, packages proteins, synthesizes proteins, encloses products in vessicles

the synthesis of messenger RNA is called translation true or false

false

describe tight junctions

forms a water-resistance seal between cells, make sure intestinal substances pass through the epithelial cells, not between them, comprised of adhesion proteins

faciliated diffusion occurs - into the cell only - out of the cell only - in either direction depending on the temp - in either direction depending of the concentration gradient of the molecule - in either direction depending of the size of the molecule

in either direction depending on the concentration gradient of the molecule