The technique used to introduce foreign DNA into animal cells by fine needle injection is:
A. Lipofection
B. Biolistics
C. Electroporation
D. Microinjection
Answer: Option D
Solution (By JKExamLibrary)
Microinjection uses a very fine glass micropipette to inject DNA directly into the nucleus of a target cell. Electroporation uses electrical pulses, biolistics is gene gun for plant cells, lipofection uses lipid vesicles.
Explanation:
Ethology is the branch of biology that deals with the scientific and objective study of animal behavior, usually with a focus on behavior under natural conditions. Ecology studies ecosystems, Entomology studies insects, and Eugenics deals with the improvement of human genetic traits.
Explanation:
Streptococcus thermophilus and Lactobacillus bulgaricus are used as starter cultures in yogurt production. They ferment lactose to lactic acid, causing milk proteins to coagulate, giving yogurt its thick texture and tangy taste. Bacillus cereus causes food poisoning, E. coli can be pathogenic, Salmonella causes typhoid.
Explanation:
Vitamin K is a cofactor for γ-glutamyl carboxylase, which modifies glutamate residues in clotting factors, enabling calcium binding and coagulation.
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