A urine culture was set up using a 0.001-mL calibrated loop. It yielded 100 colonies. Which of the following results would be reported to the physician?
A) 100 CFU/mL
B) 1,000 CFU/mL
C) 10,000 CFU/mL
D) 100,000 CFU/mL
D) 100,000 CFU/mL
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A testcross involves crossing with a(n) _________ individual and is used to determine the _________ of the tested parent
A. homozygous dominant; phenotype B. homozygous recessive; phenotype C. homozygous dominant; genotype D. homozygous recessive; genotype E. F2 offspring; parental genotype
Pufferfish (Fugu) are a delicacy in Japan, but must be cleaned very carefully as their liver contains tetrodotoxin which blocks voltage-gated Na+ channels. Imagine you are testing for the presence of this toxin using a neuron in a dish. You apply an electrical stimulus to the neuron that should produce an action potential. What will you observe if tetrodotoxin levels are high enough to block the
neuron's voltage-gated Na+ channels? A. The neuron will exhibit a slow depolarization even before the stimulus is applied and then a normal action potential. B. The neuron will exhibit a slow hyperpolarization even before the stimulus is applied. C. The neuron will show a normal resting potential, but not exhibit depolarization when the stimulus is applied. D. The neuron will depolarize and exhibit rapid depolarization, but will not repolarize. E. The neuron will depolarize normally, but then become hyperpolarized such that the membrane potential is much lower than usual.
Which of the following is likely to be true, based on the following cladogram?
1.Amphibians and lungfishes are sister groups.
2.Amphibians and amniotes both have four limbs and a swim bladder or lungs.
3.Amphibians and lungfishes both have four limbs and a swim bladder or lungs.
4.All of the groups listed have a backbone and a skull.
All the mass of an atom is considered to be in the:
A) protons and neutrons. B) electrons only. C) protons, neutrons, and electrons. D) protons only.