The SA node, also known as the __________ spontaneously generates the action potentials that set the pace for
cardiac contractions. Fill in the blank(s) with the appropriate word(s).
ANSWER: cardiac pacemaker
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The American redstart (Setophagaruticilla) is in serious decline. Scientists have been able to correlate health and breeding success to levels of 13C in their blood (a chemical signature indicating the source of their diet). Birds with lower levels of 13C in their blood return to their spring breeding ground sooner, weigh more and produce more offspring. Based on this, what would you expect to find in the wintering grounds of the American redstart? Check all that apply.
_____ Limited availability of habitat in areas where plants have low13C. _____ Higher insect biomass in areas where plants have low13C. _____ A lack of territorial behavior being displayed by American redstarts. _____ Differences in food quality correlating with levels of 13C in the habitat. _____ Similar flora and fauna in all redstart habitats, unrelated to levels of 13C. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about habitat loss and songbirds? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Although transposable elements and short tandem repeats (STRs) are repetitive DNAs, they differ in that _____
A) STRs occur within exons; transposable elements occur within introns B) STRs occur within introns; transposable elements occur within exons C) the repeated unit in STRs is clustered one after another; transposable element repeats are scattered throughout the genome D) the repeated unit in STRs is much larger than the repeated unit of transposable elements
Which of the following is NOT an innate body defense?
a) complement b) the skin and mucous membranes c) antibodies d) lysozyme
Which of the following groups belong to the domain of the prokaryotes?
a. bacteria b. protists c. fungi d. animals