What would a nerve poison that blocked neurotransmitter receptors on the dendrites do?
A) It would cause continued stimulation of the membrane of the receiving neuron.
B) It would prevent transmission across the synaptic cleft.
C) It would inhibit the regeneration of neurotransmitter for use by the synaptic knobs.
D) It would inactivate the enzyme that degrades the neurotransmitter.
B
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Which of the following is the correct sequence of events during mitosis?
A. Sister chromatids split, nuclear membrane dissolves, nuclear membrane forms, chromosomes line up B. Nuclear membrane dissolves, chromosomes line up, sister chromatids split, nuclear membrane forms C. Nuclear membrane forms, chromosomes line up, sister chromatids split, nuclear membrane dissolves D. Chromosomes line up, nuclear membrane forms, nuclear membrane dissolves, sister chromatids split
You are studying an enzyme-catalyzed reaction that induces a particular cellular activity in the lab. If you wanted to slow down that particular cellular activity by controlling the enzyme, what could you do?
A. Decrease the temperature of the incubator where the cells are growing B. Increase the pH of the media the cells are growing in to the optimum pH C. Add cofactors to the media the cells are growing in D. Add an allosteric activator to the cells
Identical twins can result from
a. the fusion of two sets of identical gametes. b. a division of a zygote into two separate cells that develop into two separate embryos. c. the fusion of two paternal gametes with a single maternal gamete that then divides. d. a lack of chromosomal separation during meiosis resulting in gametes that are diploid and don't need to be fertilized. e. a mechanism that is not understood.
The carbon atoms in organic compounds typically form ________ with other atoms.
A. nonpolar covalent bonds B. polar covalent bonds C. ionic bonds D. hydrogen bonds E. either ionic or hydrogen bonds