LB stands for Lysogeny Broth and is used as what in the lab?

LB stands for Lysogeny Broth and is used as what in the lab?

• A. A chemical used in gel.
• B. A nutrient medium to grow bacteria.
• C. A DNA ladder.
• D. A type of antibiotic.

Answer: (B)

The main idea here is that LB is a general-purpose growth medium. LB, or Lysogeny Broth, is a nutrient-rich liquid (and, when solidified with agar, LB agar) used to grow bacteria. It supplies essential nutrients—proteins and peptides from tryptone, vitamins and growth factors from yeast extract, and salts for osmotic balance—that bacteria need to multiply. This makes it ideal for cultivating many common lab strains, like E. coli, when you want robust, non-selective growth. It’s not a gel chemical, a DNA ladder, or an antibiotic, which is why describing it as a nutrient medium to grow bacteria is the best fit.

The main idea here is that LB is a general-purpose growth medium. LB, or Lysogeny Broth, is a nutrient-rich liquid (and, when solidified with agar, LB agar) used to grow bacteria. It supplies essential nutrients—proteins and peptides from tryptone, vitamins and growth factors from yeast extract, and salts for osmotic balance—that bacteria need to multiply. This makes it ideal for cultivating many common lab strains, like E. coli, when you want robust, non-selective growth. It’s not a gel chemical, a DNA ladder, or an antibiotic, which is why describing it as a nutrient medium to grow bacteria is the best fit.