Assertion (A): The pancreas is a mixed gland. Reason (R): It has exocrine acini secreting enzymes and endocrine islets secreting hormones. MCQ with Answer and Explanation
Consider the following statements about enzymes:
1. Enzyme activity is affected by pH.
2. All enzymes have an optimum temperature around 37°C.
3. Enzymes are reusable.
Which of the above is/are correct?
Explanation:
Enzyme activity depends on pH and temperature; they are not consumed (reusable). Optimum temperature varies; human enzymes around 37°C, but bacterial enzymes can be higher. So 2 is not universally true.
Explanation:
Autotrophs (self-feeders) include photoautotrophs (plants, algae, cyanobacteria) and chemoautotrophs (some bacteria). They produce organic matter from COâ‚‚. Heterotrophs depend on others, saprotrophs decompose dead matter, parasites live on hosts.
Explanation:
Electroporation uses an electric field to create temporary pores in the cell membrane, allowing DNA to enter. Heat shock is a chemical method using CaClâ‚‚ and temperature shift, microinjection physically injects DNA into cells, biolistics is a gene gun for plant cells. Electroporation is efficient for many cell types.
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