The use of enrichment cultures and selective media was pioneered by
A. Pasteur.
B. Beijerinck.
C. von Behring.
D. Jenner.
Answer: B
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A person who has two identical alleles for a particular gene is ________ for that gene.
A) dominant B) heterozygous C) homozygous D) positive
Identify the incorrect statement from below
A. Donor (TetR) and Recipient (StrepR) grow only on those antibiotic plates to which they are resistant. B. Donor and Recipient being sensitive to Streptomycin and Tetracycline respectively will not grow on those antibiotic plates. C. Both parental strains do not grow on the double antibiotic plate as it contains one or the other antibiotic to which they are sensitive. D. There is no gene transfer of antibiotic resistance from F factor of donor to recipient. E. A bacterial lawn is also seen on plating conjugated sample on the individual antibiotic plates.
Which of the following best describes the bacterial cell wall?
A) Protects the cell from osmotic lysis B) Contributes to pathogenicity C) Site of action of several antibiotics D) All of the above
Character states shared by the ancestor or outgroup of a clade are called
A. derived traits. B. synapomorphies. C. plesiomorphies. D. homoplasies. E. symplesiomorphies.