Luteinizing hormone is considered a gonadotropin because of which one of the following reasons?
A) It stimulates the growth and development of gonads, but only in females.
B) It stimulates the growth but not the development of gonads in males.
C) It promotes the growth of reproductive organs in both males and females.
D) It functions to complement the activity of TSH.
E) It triggers the production of gonadotropin hormones.
C
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Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. If cells are removed from the middle of the dish, the cells bordering the open space will begin dividing until they have filled the empty space. What does this experiment show?
A. Cells continue to grow as long as there is adequate space. B. The controls on cell growth and division can be turned on and off. C. When cells come into contact with other cells, they stop growing. D. Cell division can be regulated by factors outside of the cell. E. All of the answer choices are correct.
An excitatory postsynaptic potential (EPSP):
a. results in a partial depolarization of the neuron. b. causes a neuron to fire. c. prevents a neuron from firing. d. results in a partial hyperpolarization of the neuron. e. results in partial depolarization of presynaptic neurons, causing ions to pass through connecting channels.
Which statement concerning gravity detection in humans is true?
a. Statoliths are pulled down by gravity, stimulating hair cells of the statocysts. b. Otoliths are pulled down by gravity onto stereocilia, stimulating nerve impulses. c. Gravity moves the cupula, causing hair cells of the lateral line organs to bend. d. Gravity pulls on the hair cells of the basilar membrane, stimulating nerve impulses. e. Gravity moves perilymph over the hair cells of the tectorial membrane.
A specific stretch of DNA that programs the amino acid sequence of a polypeptide is a ________
A) gene B) protein C) nucleic acid D) enzyme