Incomplete penetrance indicates that individuals who possess a dominant trait always express the trait
Indicate whether the statement is true or false
FALSE
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The phrase "all or nothing," used in conjunction with discussion about an action potential, means that
a. a resting membrane potential has been received by the cell. b. nothing can stop the action potential once the threshold is reached. c. the membrane either achieves total equilibrium or remains as far from equilibrium as possible. d. propagation along the neuron is saltatory. e. the action potential is strong.
The digestive enzyme pepsin works in the acidic environment of the stomach to hydrolyze peptide bonds. As a result, pepsin affects which macromolecule?
A. protein B. lipid C. carbohydrate D. DNA
Which of the following is true about the genetic code?
A. All organisms use essentially the same genetic code. B. The codon signaling the end of transcription also codes for an amino acid. C. There are multiple codons signaling the start of transcription. D. Each amino acid is specified by only one codon. E. A codon is three to six bases long.
Adult giraffes can be up to 20 ft. tall, and thus require special adaptations to maintain appropriate blood pressure. One adaptation is the rete mirabile, a group of blood vessels that form a web or net-like structure to slow blood flow.The giraffe, as the tallest living land animal, has several adaptations for its height. To prevent blood from pooling in the head when it bends down to drink, the jugular veins of a giraffe have multiple one-way valves. Furthermore, a web of arteries and veins in the neck called the rete mirabile ("wonderful net") slows the flow of blood into the brain. These specializations of the ________ act as mechanisms to maintain ________.
A. circulatory system; blood pressure homeostasis B. nervous system; temperature homeostasis C. circulatory system; pH homeostasis D. nervous system; homeothermy