Cell Surroundings - Biology Test
An animal cell that is surrounded by pure fresh water will burst because the osmotic pressure causes
solutes to move out of the cell because the surrounding solution contains a greater solute concentration.
Smooth endoplasmic reticulum
stores calcium ions in muscle cells and synthesizes lipids
Five dialysis bags, constructed from a semipermeable membrane that is impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed) and the percent change in mass of each bag was graphed.Which line in the graph represents the bag that contained a solution isotonic to the 0.6 M solution at the beginning of the experiment? Select one: a. C b. B c. E d. A e. D
C
What kinds of molecules do NOT pass through a cell membrane most easily? a. ionic correct b. large and hydrophobic c. certain types of proteins Incorrect d. large polar correct e. small and hydrophobic
Ionic, certain types of proteins, large polar and large and hydrophobic.
A patient has had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, distilled water-equal to the volume of blood lost-is transferred directly into one of his veins. What will be the most probable result of this terrible transfusion?
The patient's red blood cells will swell because the blood fluid has become hypotonic compared to the cells.
Which organelle acts like the stomach of the cell, using digestive enzymes to break down organic molecules?
lysosomes
When fluids can cross the membrane without using cellular energy, this is called
passive transport
The diffusion of water occurs across some membranes because the membrane is considered
selectively permeable
Celery stalks that are immersed in fresh water for several hours become stiff and turgid. Similar stalks left in a 0.15 M salt solution become limp and soft. From this we can deduce that a. the fresh water is isotonic and the salt solution is hypertonic to the cells of the celery stalks. b. the fresh water and the salt solution are both hypotonic to the cells of the celery stalks. c. the fresh water and the salt solution are both hypertonic to the cells of the celery stalks. d. the fresh water is hypertonic and the salt solution is hypotonic to the cells of the celery stalks. e. the fresh water is hypotonic and the salt solution is hypertonic to the cells of the celery stalks.
the fresh water is hypotonic and the salt solution is hypertonic to the cells of the celery stalks.
The function of the nucleolus is
to manufacture ribosomes.
In an oil-based, nonpolar environment, phospholipids would arrange themselves so that they:
would stay together but in a reverse orientation, with their tails projecting outward
