Read the statements and decide whether they are true (T) or false (F). Correct the wrong statements
1. Prokaryotic cells have no true nucleus.
2. Plant cells have no vacuole.
3. Mitochondria produce energy for the cells.
4. Osmosis uses energy.
5. Peroxisomes play a role in protein synthesis.
Choose the correct answer.
Which of the following is not a cell organelle?
A) Vacuole B) Lysosome C) Ribosome D) Chromosome E) Golgi body
Which of the following produces food?
A) Ribosome B) Vacuole C) Nucleus D) Lysosome E) Chloroplast
Which of the following belongs to only plant cells?
A) Chloroplast B) Ribosome C) Lysosome D) Peroxisome E) Golgi body
Which of the following belongs to only animal cells?
A) Golgi body B) Cell wall C) Centrosome D) Ribosome E) Cytoplasm
Which of the following has prokaryotic cells?
A) Bacteria B) Animals C) Human D) Plants E) None of them.
Fill in the blanks
1…….is the smallest living unit.
2. The ……..cell has a true nucleus.
3 ………..provides material exchange in and outof the cell.
4 ………….. is the wastebasket of the ceil
5. Animals have………… type of cell.
Text for additional reading.
Read the text. Find out key sentences and summarize the text.
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Cancer or terrorism in the body
Cancer is an abnormal growth of the body's own cells. That is, normal cells in your body decide to "mutiny" and "selfishly" take over the organ or tissue they are normally a part of, with wild uncontrolled growth. Cancer occurs when our normal cells become altered at the genetic and biochemical level in a way that permits them to divide into many more cells than would normally be present in that tissue.
Cancer is not an infectious or contagious disease like the flu, the common cold, or a bacterial infection. You can't catch it from a patient's handshake or sneeze. Cancer is really a collection of many different diseases under a single heading. Some forms of cancer, but not all, are heritable. Some, but not all, forms of cancer are caused by exposure to chemicals, or radiation, or viruses. And, different types of cancer are caused by different genetic and environmental factors.
Steps to Prevent or Reduce the Risk of Cancer:
1. Stop smoking tobacco, and avoid spending time with smokers.
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2. Stop chewing tobacco.
3. Reduce exposure to CIV radiation in sunlight and tanning lamps.
4. Reduce fat in your diet.
5. Increase fiber and vegetables in diet (although this is under debate).
6. Maintain a balanced diet, including vitamins and minerals.
7. Test your basement at home for radioactive radon.
8. Reduce the number of X-rays taken by dentists and physicians
9. Avoid promiscuous sexual relations to reduce risk of viral sexually transmitted diseases. Abstain from sex or remain faithful to your spouse.
10. Avoid exposure to industrial chemicals (e.g. pesticides, insecticides, organic solvents, etc. )
UNIT-3 GENETICS
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