A drug that inactivates acetylocholinesterase
a. stops the release of ACh from presynaptic endings
b. prevents the attachment of ACh to its receptor
c. increases the ability of ACh to stimulate postsynaptic cells
d. all of these are correct
Answer: c. increases the ability of ACh to stimulate postsynaptic cells
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Which of the following prenatal tests can be
performed earliest in a pregnancy?
a. amniocentesis b. obstetric sonography c. fetoscopy d. chorionic villus sampling e. preimplantation genetic diagnosis
Scientific knowledge and reasoning can provide an empirically-based perspective to inform society's decision making. For example, a genetic counselor may discuss with parents the probability of them having a child with a genetic disease caused by a recessive allele. The counselor may use a Punnett square to illustrate the chances of having such a child. What is this genetic counselor using when constructing the Punnett square to advise these parents?
A) how certain traits are determined by more than one gene B) how mutations can affect the genetic information C) Mendel's law of segregation D) Mendel's law of independent assortment
Changes in the shape of a cell usually involve a reorganization of the _____
A) nucleus B) cytoskeleton C) extracellular matrix D) transport proteins
Some of the structural components of Staphylococcus act as virulence factors. Which of the following components inhibits chemotaxis and phagocytosis, inhibits proliferation of mononuclear cells?
A. Capsule B. Peptidoglycan C. Protein A D. Teichoic acid E. Slime layer