A human skin cell contains 46 chromosomes (23 paternally inherited and 23 maternally inherited). Before mitosis begins, this cell must duplicate its genetic material. What are the products of this duplication?
A) 92 chromosomes, each consisting of 2 homologous chromatids connected by a centromere
B) 23 chromosomes, each consisting of a maternal and a paternal chromatid connected by a centromere
C) 92 chromatids, each consisting of 2 sister chromosomes connected by a kinetochore
D) 92 sister chromatids, in 46 pairs that are connected by a centromere
E) 46 chromosomes, each consisting of 2 sister chromatids connected by a kinetochore
D) 92 sister chromatids, in 46 pairs that are connected by a centromere
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The dinoflagellate Pfisteria is an important protist. Which of the following statements DOES NOT describe its attributes?
A. It causes nervous disorders in humans. B. It uses toxins to attack fish which it then consumes. C. It lies dormant on the bottom until stimulated by chemicals from fish. D. It is a major cause of food poisoning in humans. E. Its toxins damage fish skin thereby increasing exposure to the pathogen.
The interphase nucleus has an internal structure in which each chromosome occupies a distinct region called a chromosome territory
a. True b. False Indicate whether the statement is true or false
Which of the following groups of drugs can become incorporated into the bones and teeth of a fetus?
A) beta-lactams B) aminoglycosides C) quinolones D) tetracyclines E) sulfonamides
The chemical mediators of anaphylaxis are
A) found in basophils and mast cells. B) antibodies. C) antigens. D) antigen-antibody complexes. E) the proteins of the complement system.