Receptors that detect tissue damage are classified as ____
a. photoreceptors
b. chemoreceptors
c. mechanoreceptors
d. thermoreceptors
e. nociceptors
ANSWER: e
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A typical aerobic exercise prescription consists of 3-5 days/week for 20 or more minutes per session at 70-90% of maximal heart rate. More than this yields no improvements in fitness.
a. true b. false
Plaque is _____ caused by _____
a. an infectious disease; bacterial biofilms d. a non-infectious disease; E. coli b. a non-infectious disease; inflammation of the gums e. an infectious disease; E. coli c. an infectious disease; non-pathogenic bacteria
A new winged species is discovered in the Amazon rainforest. Select the evidence that supports that this species’ wings are homologous to vertebrate animals and analogous to insect wings. Check all that apply.
_____ The wings have an underlying bone structure. _____ The wings are poisonous. _____ Blood vessels are networked through the wings. _____ The wings are covered in chitinous scales. 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 homologous structures? What other information is related to the question? Choose Answer Given what you now know, what information 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?
This diagram illustrates the three suggested models of DNA replication. After describing the double-helix structure of DNA, Watson and Crick stated that this structure “... immediately suggests a possible copying mechanism for the genetic material.” Based on your knowledge of the structure of DNA, which of these three models were Watson and Crick most likely considering, and why?
a. the dispersive model, because it would take advantage of the mechanisms that create homologous recombination, a process with which Watson and Crick were familiar
b. the conservative model, because it is the only model that keeps DNA strands together, eliminating most potential sources of transcription errors during replication
c. the semi-conservative model, because each nucleotide can only bond to its complement, and each strand would rebuild a second strand from available nucleotides in the cell
d. the dispersive model, because it is the only model that would allow the DNA molecule to be reconstructed from end to end, copying a single nucleotide pair at a time.