Table 6.1
Three different culture media are shown below.
$$\begin{array} { | c | c | c | }
\hline \text { Medium A } & \text { Medium B } & \text { Medium C } \
\hline \mathrm { Na } _ { 2 } \mathrm { HPO } _ { 4 } & \text { Yeast extract } & \text { Glucose } \
\hline \mathrm { KH } _ { 2 } \mathrm { PO } _ { 4 } & \text { Beef extract } & \text { Peptone } \
\hline \mathrm { MgSO } _ { 4 } & \mathrm { KH } _ { 2 } \mathrm { PO } _ { 4 } & \left( \mathrm { NH } _ { 4 } \right) _ { 2 } \mathrm { SO } _ { 4 } \
\hline \mathrm { CaC } _ { 2 } & \mathrm { MgSO } _ { 4 } & \mathrm { KH } _ { 2 } \mathrm { PO } _ { 2 } \
\hline \mathrm { NaHCO } _ { 3 } & ( \mathrm { NH } 4 ) _ { 2 } \mathrm { SO } _ { 4 } & \mathrm { Na } _ { 2 } \mathrm { HPO } _ { 4 } \
\hline
\end{array}$$
-For the three types of media in Table 6.1,which medium (or media)is/are chemically defined?
A)A
B)B
C)C
D)A and B
E)A and C

Question

Table 6.1
Three different culture media are shown below.
 $$\begin{array} { | c | c | c | } 
\hline \text { Medium A } & \text { Medium B } & \text { Medium C } \
\hline \mathrm { Na } _ { 2 } \mathrm { HPO } _ { 4 } & \text { Yeast extract } & \text { Glucose } \
\hline \mathrm { KH } _ { 2 } \mathrm { PO } _ { 4 } & \text { Beef extract } & \text { Peptone } \
\hline \mathrm { MgSO } _ { 4 } & \mathrm { KH } _ { 2 } \mathrm { PO } _ { 4 } & \left( \mathrm { NH } _ { 4 } \right) _ { 2 } \mathrm { SO } _ { 4 } \
\hline \mathrm { CaC } _ { 2 } & \mathrm { MgSO } _ { 4 } & \mathrm { KH } _ { 2 } \mathrm { PO } _ { 2 } \
\hline \mathrm { NaHCO } _ { 3 } & ( \mathrm { NH } 4 ) _ { 2 } \mathrm { SO } _ { 4 } & \mathrm { Na } _ { 2 } \mathrm { HPO } _ { 4 } \
\hline
\end{array}$$
-For the three types of media in Table 6.1,which medium (or media)is/are chemically defined?
A)A
B)B
C)C
D)A and B
E)A and C

Quizplus · Accepted Answer

Medium A is the only chemically defined medium as it contains only pure chemicals such as Na2HPO4, KH2PO4, MgSO4, CaC2, and NaHCO3. Medium B and Medium C contain complex components such as yeast extract, beef extract, and peptone, which are not pure chemicals and cannot be precisely defined in terms of their composition.

Table 61 Three Different Culture Media Are Shown Below -For the Three Types of Media in Table 6

Table 61
Three Different Culture Media Are Shown Below -For the Three Types of Media in Table 6