New York State Chemistry RegentsNew York State Earth Science Regents

 
Organization of Life
Living Environment Regents August 2008 Question 05 PDF Print E-mail
Thursday, 23 April 2009 11:33

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Correct Answer – Option 3 - Mitochondrion

Mitochondria provide the energy a cell needs to move, divide, produce secrete products, contract - in short, they are the power centers of the cell. They are distinct organelles with two membranes. Usually they are rod-shaped, however they can be round. The outer membrane limits the organelle. The inner membrane is thrown into folds or shelves that project inward. These are called "cristae mitochondriales".

Chloroplasts are specialized organelles found in all higher plant cells. These organelles contain the plant cell's chlorophyll, hence provide the green color. Chloroplasts capture light energy to conserve free energy in the form of ATP and reduce NADP to NADPH through a complex set of processes called photosynthesis.

Ribosomes are minute particles composed of protein and ribonucleic acid (RNA) that serves as the site of protein synthesis.

Vacuole is a membrane bound sac that plays a role in intracellular digestion and release of cellular waste products.

Last Updated on Thursday, 23 April 2009 11:38
 
Living Environment Regents August 2008 Question 33 PDF Print E-mail
Friday, 24 April 2009 10:26

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Correct Answer – Option 4 – D and F – gas exchange

D is the outer cell membrane of the cell and F are the lungs in the human body. Both these organs help exchange of gases. Hence, option 4 is the correct answer.

A is the nucleus of the cell which does not transmit nerve impulse. G is the liver which also does not transmit nerve impulse. Hence, option 1 is incorrect.

Photosynthesis takes place in chloroplasts and part B is mitochondria. Also, part E is the brain in the human body. Hence, option 2 is incorrect.

Plant cells respire using chloroplasts and not the cytoplasm in the cell which is part c. Also digestion in the human body occurs in the stomach and not the large intestine which is part H. Hence, option 3 is incorrect.

 
Living Environment Regents August 2008 Question 35 PDF Print E-mail
Friday, 24 April 2009 10:34

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Correct Answer – Option 2 – both inside and outside the nucleus

Option 2 is correct since according to the table DNA is present in the nucleus and the mitochondrion.

According to the table DNA is absent in the cell wall and cell membrane. Hence, the interpretation thatDNA functions within cytoplasm and outside of cell membrane in option 1 is incorrect.

Nucleus is not an energy releasing structure. However DNA is functional and present in the nucleus also. Hence, the interpretation that DNA is functional only within energy-releasing structures in option 3 is incorrect.

There is no information about vacuoles in the table above. Hence, we cannot arrive at the interpretation that DNA is functional in the vacuoles. Hence, option 4 is incorrect.

 
Living Environment Regents August 2008 Question 40 PDF Print E-mail
Friday, 24 April 2009 10:50

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Correct Answer – Option 2 – The cells of gland B and C contain different receptors than the cells of gland A

The receptors help in initiation of activity and specific receptors help in initiating generation of specific hormones. Hence, options 1, 3 and 4 are incorrect.

 


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