Self-Testing Q: How does DNA control the metabolic

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Presentation transcript:

Self-Testing Q: How does DNA control the metabolic activities of the cells? A. It controls the formation of proteins in the cells. B. It controls the chemical reactions in the cells. C. It regulates the metabolic activities of the cells. D. It controls the number of division of the cells.

Congratulations! You’ve got the correct answer! Go to next question...

DNA cannot control the chemical reactions in the cells directly. Sorry, you’ve got the wrong answer! DNA cannot control the chemical reactions in the cells directly. Try again...

DNA cannot regulate the metabolic activities of the cells directly. Sorry, you’ve got the wrong answer! DNA cannot regulate the metabolic activities of the cells directly. Try again...

DNA cannot control the number of divisions of the cells directly. Sorry, you’ve got the wrong answer! DNA cannot control the number of divisions of the cells directly. Try again...

Self-Testing A. C has cell wall but A does not. Here are photomicrographs showing (1) some cells of a human blood smear; (2) some cells of an onion epidermis: (1) (2) Q: Which of the following is NOT a structural difference between cells A and C? A. C has cell wall but A does not. B. C has small nucleus but A has large nucleus. C. C has chloroplast but A does not. D. C has vacuole but A does not.

Sorry, not correct! Try again... C is a plant cell and therefore it has cell wall. A is an animal cell and therefore it does not have cell wall. Try again...

This is a true statement. Incorrect! This is a true statement. Try again...

Congratulations! You’ve got the correct answer! Go to next question...

This is a true statement. Sorry! This is a true statement. Try again...

Self-Testing Here are photomicrographs showing (1) some cells of a human blood smear; (2) some cells of an onion epidermis: (1) (2) Q: Why does the central part of cell B looks lighter in color? A. There contains less nucleus to increase the surface area to facilitate gases diffusion. B. There contains less cytoplasm to increase the surface area to facilitate gases diffusion. C. There contains less hemoglobin to increase the surface area for gases to dissolve in. D. There is nothing in its central part as it a ring- shaped cell.

Red blood cells do not contain nucleus. Try again...

Congratulations! You’ve got the correct answer! Go to next question...

Hemoglobin itself is for carrying gases (oxygen). Sorry, you’ve got the wrong answer! Hemoglobin itself is for carrying gases (oxygen). Try again...

Red blood cell is a biconcave disc, not ring-shaped. Sorry, you’ve got the wrong answer! Red blood cell is a biconcave disc, not ring-shaped. Try again...

Self-Testing Q: What is the function of cell A? Here are photomicrographs showing (1) some cells of a human blood smear; (2) some cells of an onion epidermis: (1) (2) Q: What is the function of cell A? A. To kill germs by producing antibiotics. B. To kill germs by engulfing them. C. To expel germs out of body through urination. D. To expel germs out of body through sweating.

No! Cell A is the white blood cell. Some of them can kill germs by producing antibodies, not antibiotics. Try again...

Congratulations! You’ve got the correct answer! Go to next question...

That is incorrect! Try again... Cell A is the white blood cell, which cannot expel germs out of human body. Try again...

No! Cell A is the white blood cell, which cannot expel germs out of human body. Try again...

Self-Testing A. Cell B will remain the same. B. Cell B will burst. Here are photomicrographs showing (1) some cells of a human blood smear; (2) some cells of an onion epidermis: (1) (2) Q: What would happen to cell B if they were put into a concentrated salt solution for half an hour? A. Cell B will remain the same. B. Cell B will burst. C. Cell B will be plasmolysed. D. Cell B will shrink.

Not quite! Osmosis is occurring between cell B and the salt solution. Therefore, cell B cannot remain the same. Try again...

Cell B will burst only if it was put into a dilute solution. No. Cell B will burst only if it was put into a dilute solution. Try again...

That is not right. Try again... Plasmolysis will occur only when a plant cell is put into a concentrated solution due to the presence of cell wall in plant cell. Try again...

Great! You’ve got the correct answer! Go to next question...

Self-Testing A. Cell B will remain the same. B. Cell B will burst. Here are photomicrographs showing (1) some cells of a human blood smear; (2) some cells of an onion epidermis: (1) (2) Q: What would happen to cell C if they were put into a hypertonic solution? A. Cell B will remain the same. B. Cell B will burst. C. Cell B will be plasmolized. D. Cell B will shrink.

Oops! Osmosis is occurring between cell C and the hypertonic solution. Therefore, cell B cannot remain the same. Try again...

Not since I last checked! Cell C will not burst even if it was put into a dilute solution due to the presence of the cell wall. Try again...

Wonderful! You’ve got the correct answer! Click here to end

Cell C will not shrink due to the presence of the cell wall. Try again...