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- Question
Which best describes the structure of a DNA molecule?
Options- A. A double helix
- B. A strand of nucleic acids
- C. A single strand of amino acids
- D. A sugar ring
- Correct Answer
- A double helix
ExplanationDNA is not a single stranded and does not have amino acids. Hence options, b & C are eiminated. Dna is a double helix structure containing nucleobase?either cytosine (C), guanine (G), adenine (A), or thymine (T)?as well as a monosaccharide sugar called deoxyribose and a phosphate group.
- 1. Enzymes are important because they
Options- A. maintain cell shape
- B. transfer genetic information
- C. contain water
- D. speeds up chemical reactions Discuss
- 2. Where does most digestion take place?
Options- A. Stomach
- B. Large intestine
- C. Small intestine
- D. Mouth Discuss
- 3. Which describes how mRNA is used by a cell?
Options- A. It is used to move information to other cells.
- B. It is used to check DNA for mutations.
- C. It is used to replicate DNA for mitosis.
- D. It is used to transfer genetic information. Discuss
- 4. Tubes that bifurcate from the windpipe
Options- A. Bronchi
- B. pleura
- C. Apex
- D. Adenoids Discuss
- 5. Which of the following statements about DNA replication is true?
Options- A. Single?strand binding proteins stabilize the open conformation of the unwound DNA.
- B. Okazaki fragments are DNA fragments synthesized on the leading strand.
- C. DNA polymerase adds dNTP monomers in the 3?-5? direction.
- D. DNA gyrase unwinds the DNA double helix. Discuss
- 6. Blood plasma is filtered in
Options- A. the renal capsule
- B. the renal column
- C. the renal tubule
- D. the renal corpuscle Discuss
- 7. Which of these statements is true of the kingdom protista?
Options- A. All are unicellular
- B. All are hetertrophic
- C. All are autotrophic
- D. All are eukaryotic Discuss
- 8. The blind spot of the eye is where the optic nerve leaves the eyeball.
Options- A. TRUE
- B. FALSE Discuss
- 9. What is the structural unit of compact bone?
Options- A. Osteon
- B. Spongy bone
- C. Lamellae
- D. Periosteum Discuss
- 10. Which RNA base pairs with the adenine in DNA?
Options- A. Thymine
- B. Cytosine
- C. Both A & B
- D. Uracil Discuss
Biology problems
Search Results
Correct Answer: speeds up chemical reactions
Explanation:
Enzymes in the body are those which play an important role of breaking down the larger molecules to small and speeds up the chemical reactions.
Correct Answer: Small intestine
Explanation:
The digestion process starts in the mouth and the complete digestion process completes in the small intestine where all the nutrients in the food are absorbed.
Correct Answer: It is used to transfer genetic information.
Explanation:
A RNA copy of a DNA gene is called as messenger RNA or mRNA. mRna is used in translation because information is translated from one language (nucleotides) into another (amino acids).
Hence, mRNA is used to transfer genetic information by a cell.
Correct Answer: Bronchi
Explanation:
Tubes that bifurcate from the windpipe are called Bronchi.
Correct Answer: Single?strand binding proteins stabilize the open conformation of the unwound DNA.
Correct Answer: the renal capsule
Correct Answer: All are eukaryotic
Correct Answer: TRUE
Correct Answer: Osteon
Correct Answer: Uracil
Explanation:
In DNA, adenine pairs with Thymine. Similarly, in RNA, due to absence of thymine in RNA and the same structure with uracil helps to pair with adenine.
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