New York State Chemistry RegentsNew York State Earth Science Regents

 
Laboratory Skills: Scientific Inquiry and Techniqu
Living Environment Regents August 2010 Question 32 PDF Print E-mail
NYS Living Environment Regents August 2010
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Correct answer: (2) make cell structures more visible

Stains are used to help microscope viewers see the different structures of a specimen. Iodine is an example of a stain commonly used in laboratories. Iodine is used as a starch indicator, making structures with starch dark blue in color.

Incorrect answers:

(1) eliminate some organelles

An organelle is one of the several formed bodies with a specific role and suspended in the cytoplasm of eukaryotic cells. Stains are not applied to destroy these organelles because when this happens, the cell viewed on the microscope would be destroyed.

(3) use the high-power lens

No staining agent is needed to use the high-power lens. Just move the nosepiece to move the lens from one objective to another.

(4) remove water from the slide

If water is removed from the wet-mount, the cell will dry up and the cell shown on the microscope will be disrupted.
 
Living Environment Regents January 2008 Question 75 PDF Print E-mail
NYS Living Environment Regents January 2008
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Option 1 – Separating DNA fragments

Electrophoresis is the motion of dispersed particles relative to a fluid under the influence of an electric field that is space uniform.

It is not a method for changing genetic code or indicating presence of starch or separating color compounds. Hence, options 2,3 and 4 are incorrect.
 
Living Environment Regents January 2008 Question 73 PDF Print E-mail
NYS Living Environment Regents January 2008
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Substance B is a complex carbohydrate and it did not move out of the model cell since it is a large molecule.
 
Living Environment Regents January 2008 Question 72 PDF Print E-mail
NYS Living Environment Regents January 2008
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Name of substance C

Direction of Movement of Substance C

Reason for the movement of Substance C

iodine

High to low concentration

diffusion

Starch indicator

Into cell

Small size molecules


 
Living Environment Regents January 2008 Question 60 PDF Print E-mail
NYS Living Environment Regents January 2008
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Hypothesis – If pill bugs are given a choice of light or darkness, they will prefer the light area.

The independent variable would be the presence or absence of light

The 2 conditions that should be kept the same in all experimental setups are species of pill bugs and temperature.

More pill bugs are found in the light area after completion of the experiment
 
Living Environment Regents January 2008 Question 55 PDF Print E-mail
NYS Living Environment Regents January 2008

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According to the graph the net change in the carbon dioxide level during the years 1960 through 2000 is 50 ppm

 
Living Environment Regents January 2008 Question 52 PDF Print E-mail
NYS Living Environment Regents January 2008
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Living Environment Regents January 2008 Question 51 PDF Print E-mail
NYS Living Environment Regents January 2008
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Living Environment Regents January 2008 Question 33 PDF Print E-mail
NYS Living Environment Regents January 2008

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Option 1 – Shorter than bar X and placed to the left of bar X

This interpretation arises from the fact that the value of X is increasing from left to right and vice versa on the x-axis and the relative amount of ATP produced is increasing from bottom to top and vice versa.

 
Living Environment Regents January 2008 Question 05 PDF Print E-mail
NYS Living Environment Regents January 2008

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Option 4 – injecting 1mL of Drug A into 100 white mice with cancer and 1mL of distilled water into another group of 100 white mice of cancer.

 
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