ara+ and lac+ are genes required for metabolizing the sugars arabinose and lactose, respectively, and ala+ and...

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Biology

ara+ and lac+ are genes required formetabolizing the sugars arabinose and lactose, respectively, andala+ and leu+ are genes required for synthesizingthe amino acids alanine and leucine. You are given the followingstrains:
Strain 1: leu- ala+ ara+lac+
Strain 2: leu+ ala- ara+lac-
Strain 3: leu+ ala+ ara+lac-
Strain 4: leu+ ala- ara-lac-
Which of these strains will grow on minimal media withglucose?
A.
2, 4
B.
2, 3, 4
C.
3
D.
1, 3
E.
1
ra+ and lac+ are genes required formetabolizing the sugars arabinose and lactose, respectively, andala+ and leu+ are genes required for synthesizingthe amino acids alanine and leucine. You are given the followingstrains:
Strain 1: leu- ala+ ara+lac+
Strain 2: leu+ ala- ara+lac-
Strain 3: leu+ ala+ ara+lac-
Strain 4: leu+ ala- ara-lac-
Which of these strains will grow on minimal media witharabinose?
A.
1
B.
2, 3, 4
C.
2, 4
D.
3
E.
1, 3
ara+ and lac+ are genes required formetabolizing the sugars arabinose and lactose, respectively, andala+ and leu+ are genes required for synthesizingthe amino acids alanine and leucine. You are given the followingstrains:
Strain 1: leu- ala+ ara+lac+
Strain 2: leu+ ala- ara+lac-
Strain 3: leu+ ala+ ara+lac-
Strain 4: leu+ ala- ara-lac-
Which of these strains will grow on minimal media withlactose + leucine?
A.
3
B.
1, 3
C.
1
D.
2, 3, 4
E.
2, 4

Answer & Explanation Solved by verified expert

4.3 Ratings (678 Votes)

1 Which of these strains will grow on minimal media with glucose Strain 1 leu ala ara lac Strain 2 leu ala ara lac Strain 3 leu ala ara lac Strain 4 leu ala ara lac Ans For any strain to grow in minimal media it must possess all wild type genes ie genes for amino acid synthesis genes for metabolizing carbon source etc Therefore the strains mutant for gene of any amino acid will not grow in this case the strains with either leu or ala will fail to grow Only the strains with leu and ala will grow Since the question See Answer

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