Who played a decisive role in the refutation of theory of 'Spontaneous Generation'?
A. Ignatz Semmelweis
B. Alexander Fleming
C. Louis Pasteur
D. Robert Koch
E. Joseph Lister
Ans: C. Louis Pasteur
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Bread mold can grow in a minimal medium without supplements (wild type) while certain mutated strains (mutants) can only grow in a minimal medium that is supplemented with specific intermediates found in the following metabolic pathway for arginine synthesis:
minimal ------> ornithine -------> citrulline ------> arginine, where enzyme 1 converts the precursor to ornithine, enzyme 2 converts ornithine to citrulline, and enzyme 3 converts citrulline to arginine. Which of the following would be TRUE of a strain that can grow in minimal medium containing ornithine, citrulline, or arginine, but not in minimal medium alone? A. The strain would have a mutation in the gene that encodes enzyme 1. B. The strain would have a mutation in the gene that encodes enzyme 2. C. The strain would have a mutation in the gene that encodes enzyme 3. D. The strain would have a mutation in the gene that encodes for enzymes 1, 2, and 3. E. The strain would be the wild type with no genetic mutations.
The basic unit of contraction in a skeletal muscle is ____
a. the cell b. the myofibril c. a sarcomere d. actin e. myosin
What is the principal driving force for movement of water into and through the plant shoot?
a. upward pressure as sugar is forced into the roots b. pumping by the xylem cells c. passive transport d. transpirational pull
Hich of the following is part of the pectoral girdle?
Femur Pelvis Scapula Skull