निम्नलिखित में से कौन सा सूक्ष्मजीवों की वृद्धि को प्रभावित करने वाले आंतरिक कारकों (intrinsic factors) का एक उदाहरण है?

Which of the following is CORRECT regarding the composition of viroids?

Why can yeast not produce alcoholic beverages with an alcohol content higher than ~13% naturally?

Which staining technique is used to differentiate bacteria into gram-positive and gram-negative based on their cell wall properties?