Chemotherapeutic agents that are chemically modified natural products of microorganisms are most specifically referred to as ________.
A. antimicrobial agents
B. semisynthetic drugs
C. synthetic drugs
D. antibiotics
Answer: B
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Some cancer cells produce the enzyme ________, which avoids stimulating apoptosis based on the number of cell divisions.
Fill in the blank(s) with the appropriate word(s).
Which event could result in an inversion?
A) A 360° rotation of a chromosomal region following two double-strand breaks in a chromosome's DNA. B) A crossover between two DNA sequences in different places on the same chromosome and that are inverted repeats of each other. C) A crossover between two repeated DNA sequences that are in different places on the same chromosome and are oriented in the same direction. D) A crossover between two repetitive sequences on different chromosomes.
Which part of a bone contains mostly stored fat?
A) red bone marrow B) fibrous connective tissue C) spongy bone D) yellow bone marrow
The Golgi apparatus is responsible for the ________.
A. formation of mesosomes B. replication of chromosomes C. the assembly of ribosomes D. packaging of materials for excretion