What is our null hypothesis for genotype ratios? Yes, that's correct!
a. 9:3:3:1
b. 1:1:1:1
c. 3:1
d. 9:7
Answer: b. 1:1:1:1
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If you applied a drug which could prevent action potentials to a muscle cell, what would be the result when a motor neuron fired?
A. no contraction since that requires an action potential B. normal contraction C. release of calcium outside the muscle cell D. a graded potential in the neuron E. None of the answer choices is correct.
Adaptations of the kangaroo rat to living in the dry,
hot environment of the southwestern United States include a. behavioral modifications that result in nocturnal activity patterns and daytime staying in burrows. b. a kidney that conserves body water better than that of humans. c. the ability to utilize water produced in the metabolism of carbohydrates. d. mechanisms that reduce evaporative water loss from the respiratory system. e. all of these.
Which of the following is NOT associated with meiosis?
a. reduction of the number of chromosomes b. somatic cells c. sexual reproduction d. sperm and egg e. germ cells
Over 90% of Staphylococcus aureus bacteria can withstand the effect of penicillin. Why?
A. They produce Beta-lactamase. B. Cell division occurs in successively different planes, and the daughter cells remain attached to one another. C. They produce coagulase. D. They have loosely organized polysaccharide slime layers. E. They produce staphylokinase, which dissolves fibrin threads in blood clots