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- Question
Polynucleotide chain of DNA contains
Options- A. a nitrogenous base, deoxyribose sugar and phosphate group
- B. a nitrogenous base, ribose sugar and phosphate group
- C. deoxyribose sugar, ribose sugar and phosphate group
- D. a nitrogenous base and phosphate group only
- Correct Answer
- a nitrogenous base, deoxyribose sugar and phosphate group
ExplanationThe two DNA strands are called polynucleotidesbecause they are composed of simpler monomer units called nucleotides. Eachnucleotideis composed of one of four nitrogen-containingnucleobases (cytosine, guanine, adenine or thymine), a sugar called deoxyribose, and a phosphate group.
- 1. What is the full form of RNA?
Options- A. Ribonucleic Acid
- B. Ribonitric Acid
- C. Ribonutrient Acid
- D. Reverse Nucleic Acid Discuss
- 2. Which organ gets affected in Weil's disease?
Options- A. Liver
- B. Lungs
- C. Heart
- D. Kidney Discuss
- 3. The main protein found in milk is ____________
Options- A. Albumin
- B. Globulin
- C. Globin
- D. Casein Discuss
- 4. Goitre is caused by the deficiency of ___________
Options- A. Zinc
- B. Calcium
- C. Iodine
- D. Chlorine Discuss
- 5. Which among the following carries impure blood to human heart?
Options- A. Aorta
- B. Pulmonary vein
- C. Pulmonary arteries
- D. Vena Cava Discuss
- 6. Most viruses that infect plants possess
Options- A. single-stranded DNA
- B. single-stranded RNA
- C. double-stranded DNA and RNA
- D. double-stranded RNA only Discuss
- 7. Syngamy results information of
Options- A. haploid zygote
- B. diploid zygote
- C. non-motile male gametes
- D. motile male gametes Discuss
- 8. Bleeding of gums, falling of teeth, fragile bones and delayed wound healing occur due to the deficiency of which one of the following vitamins?
Options- A. Vitamin C
- B. Vitamin K
- C. Vitamin D
- D. Vitamin B Discuss
- 9. The plant growth regulators are small, simple molecules of diverse chemical composition. They are
Options- A. carbohydrates, fats and proteins
- B. indole compounds, adenine derivatives, carotenoids and terpenes
- C. fatty acids, glucose and vitamins
- D. vitamin C, vitamin D and glucose Discuss
- 10. Which of the following is responsible for giving colour to human skin?
Options- A. Luciferin
- B. Haemoglobin
- C. Flavonoids
- D. Melanin Discuss
Biology problems
Search Results
Correct Answer: Ribonucleic Acid
Correct Answer: Kidney
Correct Answer: Casein
Correct Answer: Iodine
Correct Answer: Pulmonary arteries
Correct Answer: single-stranded RNA
Explanation:
Generally viruses that infect plants have single stranded RNA. Viruses infecting animals have double stranded RNA or DNA. Viruses which infect bacteria have double stranded DNA.
Correct Answer: diploid zygote
Explanation:
Syngamy, also known as fertilisation occurs between the male and female gametes. Syngamy may occur either externally, outside the body of organisms or internally, inside the body. Syngamy leads to formation of a specialised cell called diploid zygote.
Correct Answer: Vitamin C
Explanation:
Deficiency of Vitamin C causes Scurvy, Swelling of gums etc.Vitamin K causes Non-clotting of blood ,Vitamin D causes Rickets in children and Osteomalasia in adults, Vitamin B 1 causes Beriberi,B2 causes Cracking of skin,reddish eye,cracking of tongue,B3 causes Whitening of hair ,mentally retardness ,B5 causes Pallagra or 4D syndrome,B6 causes Anemia,skin disease ,B7 causes Paralysis,hair falling,B11 causes Dysentery and B12 causes Jaundice and Teroile Glutemi
Correct Answer: indole compounds, adenine derivatives, carotenoids and terpenes
Explanation:
The plant growth regulators are small, simple molecules of diversechemical composition. They can be in form of indole compounds, adenine derivatives, carotenoids derivatives,terpenes or gases like ethyleneetc.The plant growth regulators are bifurcated into two groups according to their functions in a living plant body.First group of plant growth regulators are found in growth activities, for instance, cell division, flowering, fruiting and seed formation.The second group of Plant growth regulators are involved in plant responses to wounds and stresses of biotic and abiotic origin.
Correct Answer: Melanin
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