Regents Living Environment Test Preparation Practice Lab Diffusion Through A Membrane

A coverslip should be slowly lowered from a 45° angle onto a slide in order to*

(1) prevent the slide from being scratched

(2) stop the loss of water from under the coverslip

(3) ensure that the specimen being viewed will stay alive

(4) reduce the formation of air bubbles

A substance is most likely to diffuse into a cell when*

(1) it is a large organic food molecule such as protein or starch

(2) it is enclosed in an organelle such as a vacuole

(3) the concentration of the substance is greater outside the cell than inside

(4) the pH of the substance is greater than the pH of the cell

Base your answer to question 3 on the information and diagrams below and on your knowledge of biology.

The drawings below were made during a laboratory exercise in which a microscope was used to view slides of preserved protozoa. The microscope had a 10× eyepiece and two different objectives.

labs, lab, diffusion through a membrane fig: lenv12012-exam_g20.png

Which statement about the size of the organisms is correct?*

(1) Organism A is larger than organism B.

(2) Organism B is larger than organism A.

(3) Organisms A and B are both the same size.

(4) The relative size of the organisms cannot be determined from the information given.

Base your answers to questions 4 on the diagram below and on your knowledge of biology. The diagram represents a model cell setup. The locations of three different substances are indicated in the diagram.

labs, lab, diffusion through a membrane fig: lenv12013-exam_g31.png

Which statement best describes what will most likely happen after several minutes?*

(1) The contents of the model cell will change color.

(2) The liquid outside the model cell will change color.

(3) The model cell will shrink.

(4) The model cell will rupture.

The diagram below represents a compound light microscope. Several parts have been labeled.

labs, lab, diffusion through a membrane fig: lenv12014-examw_g17.png

In order to make an image brighter, which labeled part of the microscope would most likely be adjusted?*

(1) A

(2) B

(3) C

(4) D

Cell membranes are said to be selectively permeable. Which statement best explains what selectively permeable means?*

(1) The cell membrane prevents any harmful substance from entering the cell.

(2) The cell membrane lets certain substances enter the cell and keeps certain substances out of the cell.

(3) The cell membrane allows only large molecules to diffuse into the cell.

(4) The cell membrane has pores that let only water and glucose into the cell and carbon dioxide out.

Base your answers to questions 7 on the information below and on your knowledge of biology.

One of the effects of Hurricane Katrina, which devastated New Orleans in 2005, was the death of almost all of the plants in flooded areas. Initially, toxic chemicals and bacteria were suspected as a possible cause. Scientists later determined that the salt concentration in the floodwater caused the plants to die.

The death of the plants was most likely due to*

(1) water moving into plant cells from the surrounding environment

(2) water moving out of plant cells into the surrounding environment

(3) both water and salt moving from plant cells into the surrounding environment

(4) both water and salt moving into plant cells from the surrounding environment

The diagram below represents a laboratory setup used to demonstrate the movement of molecules across a selectively permeable membrane.

labs, lab, diffusion through a membrane, organization and patterns in Life, cell structure and functions fig: lenv12015-exam_g29.png

In the diagram below, draw the 5 starch and the 12 glucose molecules to show where they would most likely be located after 15 minutes. [1]

labs, lab, diffusion through a membrane, organization and patterns in Life, cell structure and functions fig: lenv12015-exam_g28.png *

The diagram below represents a laboratory technique.

labs, lab, diffusion through a membrane fig: lenv12016-examw_g21.png

State one reason a student would use this technique during a scientific investigation. [1]*

Base your answers to questions 10 on the information below and on your knowledge of biology.

An athlete bought a sport gel food and wanted to test it to see if it contained fats, starches, and glucose. The tests that the student used are shown in the table below.

labs, lab, diffusion through a membrane fig: lenv12017-exam_g19.png

The athlete received the following results from the tests.

labs, lab, diffusion through a membrane fig: lenv12017-exam_g20.png

Identify the contents of the sports gel. [1]*

There is a group of plants, known as halophytes, that has traits that enable them to survive in salty environments. Describe one change, other than death, that would be observed in the cells of a plant that did not have these traits and was planted in a salty environment. [1]*

Base your answers to questions 12 on the information below and on your knowledge of biology.

The diagram below represents a lab setup. The artificial cell (dialysis tube) contains a starch solution and the beaker contains a solution of starch indicator and water. The setup is left undisturbed for twenty minutes.

labs, lab, diffusion through a membrane fig: lenv12020-examw_g26.png

Identify one molecule, present in this setup, that will be able to pass through the dialysis tubing. [1]*

Base your answers to questions 13 on the information below and on your knowledge of biology.

An artificial cell filled with a glucose solution was placed in a beaker of water, as represented below. The beaker was left undisturbed for 20 minutes.

labs, lab, diffusion through a membrane fig: lenv62012-exam_w_g30.png

In the diagram below, draw in the expected location of the glucose molecules after 20 minutes. [1]

labs, lab, diffusion through a membrane fig: lenv62012-exam_w_g29.png *

State one advantage of using a stain to study frog skin cells with a microscope. [1]*

Base your answers to questions 15 on the diagram below and on your knowledge of biology. The diagram represents a cell and its changes as a result of two laboratory procedures, A and B.

labs, lab, diffusion through a membrane fig: lenv62013-examw_g34.png

Describe procedure A and explain why it would cause the change shown. [1]*