Question

multiple select question
select all that apply
which of the following are characteristics of an enriched medium?

• it can be used to aid in the growth of fastidious organisms.
• it contains antibiotics to assist in keeping cultures pure.
• it may contain organic substances such as blood, serum or hemoglobin.
• it may contain special growth factors.
• its components are always chemically defined.

Explanation:

1. For "It can be used to aid in the growth of fastidious organisms": Enriched media are designed to support the growth of fastidious (nutritionally demanding) organisms, so this is correct.
2. For "It contains antibiotics to assist in keeping cultures pure": Media with antibiotics are selective media, not enriched, so this is incorrect.
3. For "It may contain organic substances such as blood, serum or hemoglobin": Enriched media often add complex organic substances like blood to provide nutrients, so this is correct.
4. For "It may contain special growth factors": Enriched media can have growth factors to support fastidious organisms, so this is correct.
5. For "Its components are always chemically defined": Enriched media often have complex, undefined components (like blood), so this is incorrect.

Answer:

• It can be used to aid in the growth of fastidious organisms.
• It may contain organic substances such as blood, serum or hemoglobin.
• It may contain special growth factors.