Quiz Flashcards
Communication between the nucleus and cytosol occurs through
nuclear pores
The more metabolically active a cell is, the more ________ it’s membrane contains.
protein
The lumen of a hollow organ such as the stomach is considered to be part of the ________ environment.
external
When cancer develops in one tissue and spreads to another via the blood or the lymph, the cancer is said to have undergone what process?
metastasis
________ proteins attach loosely to other membrane proteins or polar regions of phospholipids.
Peripheral
Which cytoskeletal protein allows for intracellular transport of organelles?
Tubulin
The cellular organelle(s) responsible for packaging and transporting proteins is/are the
Golgi complex
Ribosomal RNA is formed by
nucleoli
? direct the movement of DNA during cell division
Centrioles
consists of a network of intracellular membranes with attached ribosomes
rough endoplasmic reticulum
lysosomes digest ? and ?
cellular wastes and bacteria
use an enzyme to destroy H2O2 that is toxic to the cell
Peroxisomes
What moves the fluid medium across the surface of cells that are not free to move?
cilia
Stratified squamous is a structural epithelium type that would be expected for ________.
skin
Which type of connective tissue is unusual in having relatively little extracellular matrix?
Adipose
Loose connective tissue functions in
supporting small glands
If an animal cell lacked centrioles, it would not be able to
undergo nuclear division
The tissue(s) that is/are considered excitable because of the ability to generate electrical signals is/are called
muscle tissue and neural tissue
What is a nonpenetrating (NP) solute?
A solute that will not cross the cell membrane.
Which body fluid compartment contains high levels of K+, large anions, and proteins?
intracellular fluid only
Which body fluid compartment contains higher levels of Na+, Cl-, and HCO3-?
both plasma and interstitial fluid
Water will always move from ________ areas to ________ areas, if there are no impermeable barriers.
hyposmotic, hyperosmotic
Which type of molecular movement requires energy from ATP?
Active transport
Saturation occurs when
a group of carrier proteins is operating at its maximum rate.
statements about the Na+/K+ pump
It is present in neurons. It transports Na+ out of the cell and K+ into the cell. Its activity requires the expenditure of metabolic (cellular) energy.
Hyposmotic solutions have lower
concentrations of solutes than hyperosmotic solutions.
Facilitated diffusion and active transport differ in that
ATP is necessary for active transport, but not for facilitated diffusion.
According to Fick’s law of diffusion, diffusion rate is proportional to the surface area of the membrane, the concentration gradient, and which other variable?
The permeability of the membrane
If a 10% sucrose solution is separated from a 20% sucrose solution by a membrane impermeable to sucrose, in which direction will net movement of water occur?
from the 10% sucrose solution to the 20% sucrose solution only
Membrane protein pores that are essentially always open are called ________ channels.
leak or open
What process requires clathrin to form coated pits?
Receptor-mediated endocytosis
Compared to the outside surface, the inside of a resting cell membrane is
negatively charged.
As the charge on the membrane of a typical neuron approaches 0 from -70 mV, the cell is
only depolarizing.
