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- Question
In human body, the cell growth and differentiation are highly controlled and regulated, but in cancer cells
Options- A. there is breakdown of these regulatory mechanisms leading to formation of benign and malignant tumors
- B. controlled cell divisionand over-production of genetic material occur
- C. RNA is mutated and produced in less amount
- D. DNA is mutated and produced in less amount
- Correct Answer
- there is breakdown of these regulatory mechanisms leading to formation of benign and malignant tumors
ExplanationIn cancer cells, there is breakdown of these regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancer cells appears to have lost this property. As a result of this, cancerous cells just continue to divide giving rise to masses of cells called tumors. Tumors are of two types: benign and malignant.
- 1. Nodes of Ranvier are microscopic gaps found within:
Options- A. osteoblasts
- B. gland cells
- C. chondroblasts
- D. myelinated axons Discuss
- 2. Which best describes a tetrad?
Options- A. A diploid cell
- B. Two gametes
- C. Four chromatids
- D. A haploid cell Discuss
- 3. Haemophilia is a hereditary disease carried by
Options- A. females and expressed by males
- B. males and expressed by males
- C. females and expressed by females
- D. males and expressed by females Discuss
- 4. Appetite is triggered by
Options- A. stomach enzymes
- B. pancreatic enzymes
- C. physiological drive
- D. environmental cues such as the smell or taste of food Discuss
- 5. According to Erikson, the goal of adolescence is to
Options- A. independent identity
- B. explore who they are
- C. both a & b
- D. None of the above Discuss
- 6. Where the mature sperm are produced?
Options- A. Scrotum
- B. Vas deferens
- C. Prostate gland
- D. Testes Discuss
- 7. Which of the following are longest cells of human body?
Options- A. Pancreatic cells
- B. Epethelial cells
- C. Nerve cells
- D. Epidermal cells Discuss
- 8. Which component in tobacco makes it harmful for human consumption?
Options- A. Morphine
- B. Nicotine
- C. Heroin
- D. None of these Discuss
- 9. Which of the following bacteria is responsible for the formation of curd?
Options- A. Lycopodium
- B. Yeast
- C. Lacto-bacillus
- D. Fungus Discuss
- 10. Which among the following is/are female hormones? (i) Estrogen (ii) Progesterone (iii) Testosterone
Options- A. (i) and (iii)
- B. (i) and (ii)
- C. (ii) and (iii)
- D. Only (iii) Discuss
Biology problems
Search Results
Correct Answer: myelinated axons
Correct Answer: Four chromatids
Correct Answer: females and expressed by males
Explanation:
Haemophilia is an inherited bleeding disorder where the blood doesn't clot properly. It is caused when blood does not have enough clotting factor.
The main treatment for hemophilia is called replacement therapy. Concentrates of clotting factor VIII (for hemophilia A) or clotting factor IX (for hemophilia B) are slowly dripped or injected into a vein. These infusions help replace the clotting factor that's missing or low.
Correct Answer: environmental cues such as the smell or taste of food
Explanation:
Appetite is the desire to eat food, sometimes due to hunger. Appetite is triggered by environmental cues such as the smell or taste of food. Appealing foods can stimulate appetite even when hunger is absent.
Correct Answer: both a & b
Explanation:
According to psychologist Erik Erikson, Adolescence is the period of life between childhood and adulthood. They go through the psychosocial crisis of identity versus role confusion, which involves exploring who they are as individuals. During this stage, adolescents explore their independence and develop a sense of self i.e independent identity, ego nature.
Correct Answer: Testes
Correct Answer: Nerve cells
Correct Answer: Nicotine
Correct Answer: Lacto-bacillus
Correct Answer: (i) and (ii)
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