During the inflammatory response, which type of chemical is secreted by mast cells?
1.Antibodies
2.Chemokines
3.Cytokines
4.Histamines
3
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True or false: During the incorporation of a nucleotide during transcription, appropriate hydrogen bonding is ensured before the high-energy phosphate bond is cleaved
A. true B. false
Which of the following is a trait shared by mammals and reptiles that is not shared by the other groups of chordates?
A. mammary glands B. hair C. lungs D. an amnion E. legs
Which letter(s) in the accompanying figure represents the anther?
a. A b. B c. C d. D e. both C and D
As you and a friend are entering a chemistry laboratory at your university, you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE. Your friend is an accounting major and has not had any science courses yet. She asks you what a radioactive isotope is and you respond correctly with
A. radioactive isotopes are atoms that are stable and as a result only emit energy if they are exposed to higher temperatures. B. radioactive isotopes are atoms that are unstable and as a result emit energy in a process called radioactive decay. C. radioactive isotopes are atoms that are stable and as a result emit energy in a process called radioactive decay. D. radioactive isotopes are atoms that are unstable but unless actively disturbed by some chemical process will remain intact and pose no problems.