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BACs and YACs are:...

BACs and YACs are:

A

Natural DNA obtained from bacteria and yeast

B

Useful vectors for eukaryotic gene transfer

C

Artifical DNA obtained from bacteria and yeast

D

2 & 3 both

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding BAC and YAC:** - BAC stands for Bacterial Artificial Chromosome. - YAC stands for Yeast Artificial Chromosome. - Both are types of artificial chromosomes used in genetic engineering. 2. **Source of BAC and YAC:** - BAC is derived from bacteria, specifically using components from bacterial cells to create a vector. - YAC is derived from yeast, utilizing yeast cell components to form its structure. 3. **Function of BAC and YAC:** - Both BAC and YAC serve as vectors for gene transfer, particularly useful in eukaryotic cells (which include plants and animals). - They can carry large fragments of DNA, making them suitable for cloning larger genes or genomic fragments. 4. **Characteristics of BAC and YAC:** - They are artificial constructs, meaning they are not naturally occurring but are engineered for specific purposes in biotechnology. - They can maintain large DNA inserts, typically over 300 kilobases (kb) in size, which is beneficial for genomic studies. 5. **Evaluating the Options:** - Option 1: "Natural DNA obtained from bacteria and yeast" - Incorrect, as BAC and YAC are artificial. - Option 2: "Useful vectors for eukaryotic gene transfer" - Correct, as they are indeed used for this purpose. - Option 3: "Artificial DNA obtained from bacteria and yeast" - Correct, as they are artificial constructs derived from these organisms. - Option 4: "Second and third both" - Correct, since both statements in options 2 and 3 are true. 6. **Conclusion:** - The correct answer is Option 4: "Second and third both." ---
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