Which statement about a cloning vector is incorrect?कौन सा कथन cloning vector के बारे में गलत है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: It is always a starch-digesting enzymeयह हमेशा starch digestion enzyme होता है
The direct answer is D: it is always a starch-digesting enzyme. The question asks for the incorrect statement. A cloning vector is a DNA carrier used to transport foreign DNA into a host and often to help it replicate or be selected. It can therefore carry foreign DNA, so A is correct. It can contain an ori, the origin of replication, so B is correct. It can contain a selectable marker, such as a gene allowing identification of cells that received the vector, so C is correct. D is incorrect because a vector is a DNA molecule or DNA-based carrier, not always an enzyme; it is certainly not defined as a starch-digesting enzyme. Some vectors may carry genes for various proteins, but that does not make the vector itself that enzyme. Memory cue: vector = carrier, ori = copying, marker = selection; it is not automatically a digestive enzyme.सीधा उत्तर D है: “यह हमेशा starch-digesting enzyme होता है।” प्रश्न गलत कथन पूछता है। Cloning vector एक DNA carrier है, जो foreign DNA को host तक ले जाता है और कई बार उसके replication या selection में सहायता करता है। इसलिए A सही है: वह foreign DNA carry कर सकता है। B भी सही है: उसमें ori, अर्थात origin of replication, हो सकता है। C भी सही है: उसमें selectable marker हो सकता है, जिससे vector पाने वाली cells की पहचान या selection की जाती है। D गलत है, क्योंकि vector एक DNA molecule या DNA-based carrier है, कोई निश्चित digestive enzyme नहीं; विशेष रूप से उसे हमेशा starch पचाने वाला enzyme नहीं कहा जा सकता। किसी vector में किसी protein का gene हो सकता है, पर इससे vector स्वयं वह enzyme नहीं बन जाता। याद रखें: vector = carrier, ori = copying और marker = selection; vector अपने-आप digestive enzyme नहीं होता।
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