The genetic exchange between bacteria via direct physical contact through a pilus is called:
A. Transduction
B. Mutation
C. Transformation
D. Conjugation
Answer: Option D
Solution (By JKExamLibrary)
Conjugation involves the transfer of plasmid or chromosomal DNA from a donor (F+) to a recipient (F-) through a sex pilus. Transformation is uptake of free DNA, transduction is gene transfer by bacteriophage, mutation is a change in DNA sequence. Conjugation is often considered bacterial mating.
Explanation:
The pituitary gland controls many other endocrine glands via tropic hormones (TSH, ACTH, FSH, LH). It is regulated by the hypothalamus. Thus, it is often called the master gland.
Explanation:
COVID-19 (coronavirus disease 2019) is caused by the novel coronavirus SARS-CoV-2. MERS is caused by MERS-CoV, SARS by SARS-CoV. Influenza is caused by influenza viruses.
Explanation:
Robert Koch identified Mycobacterium tuberculosis as the causative agent of tuberculosis in 1882, applying his postulates. He also discovered the cholera bacillus. Pasteur worked on vaccines, Jenner smallpox, Lister antisepsis.
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