Nys Science Lab

What observation could be made that would confirm that the molecule you identified in the last question had passed through the membrane.

• If the color of the

  liquid in the cell

  turns blue-black, the

  starch indicator

  passed into the cell.

• If the cell weighs

  more or expanded, water moved

  in.

• If the cell

  weighs less or if it shrinks, water

  moved out.

• all of the above

Tags

NGSS.MS-LS1-2

Identify the molecules that would be able to pass through the dialysis tubing in this set up

• starch indicator

• iodine

• water

• amino acids

A cube cut from a potato is placed in a beaker of distilled water. The potato cells have a

relatively high concentration of starch and a relatively low concentration of water. The

diagram represents the water and starch molecules in and around one of the potato cells

in contact with the water in the beaker.

Which row in the chart correctly describes what would be expected to occur in the potato cells, with

regard to both the starch and water molecules?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-LS1-2

NGSS.MS-LS2-1

A student was setting up beakers that contained different solutions in order to conduct a laboratory

investigation, but the next day he could not tell which beaker contained the starch and water mixture.

In order to find out which beaker contained starch, he took a small sample from each of the beakers

and conducted a test for starch on each of them.

What should the student put in the samples?

• all of these would work

• iodine

• Lugol's solution

• starch indicator

Tags

NGSS.MS-PS1-2

Which solution would be most similar in concentration to the normal internal environment of the

human circulatory system?

• solution A, only

• solution B, only

• solutions A and B

• solutions A and C

Tags

NGSS.MS-LS2-1

Which statement best describes solution C?

• The concentration of dissolved salt in the solution is greater than the concentration in the

  cells.

• The concentration of dissolved salt in the solution is less than the concentration in the cells.

• The concentration of water in the solution is greater than the concentration in the cells.

• The concentration of water in the solution is equal to the concentration in the cells.

A student filled a dialysis tube with 97% water solution and sealed the ends. The tube and its contents

had a mass of 55 grams. The student placed the tube in a solution, and the mass of the tube and its

contents increased to 60 grams. Into which solution was the dialysis tube placed?

• 0% water

• 95% water

• 97% water

• 99% water

Tags

NGSS.MS-PS1-2

A microscope slide viewed with high power can most likely be damaged by

• adding distilled water

• adding salt water

• rotating the coarse adjustment knob

• rotating the fine adjustment knob

The best explanation for why the onion cells do not burst, while red blood cells often do, is that

• the red blood cells have only a cell membrane, which does not protect them from bursting

• the onion cells do not have a cell wall that could protect them from bursting

• the onion cells have a cell membrane, which can protect them from bursting

• the red blood cells have a cell wall, which does not protect them from bursting

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Why is this the recommended procedure for placing a coverslip?

• This procedure reduces the chance of trapping air bubbles

• Reduce the size of the specimen

• Make the specimen transparent

• Make organelles more visible