One day, Tommy, a student in an undersupervised class of forty fifth graders, got the urge to pet Nemo (the clownfish), who was swimming among the waving petals of a pretty underwater "flower" that had a big hole in the midst of the petals
Tommy giggled upon finding that these petals felt sticky. A few hours later, Tommy was in the nurse's office with nausea and cramps. Microscopic examination of his fingers would probably have revealed the presence of _____. A) teeth marks
B) spines
C) spicules
D) nematocysts
D
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The types of bonds found in nucleic acids are:
A. phosphodiester bonds. B. peptide bonds. C. ionic bonds. D. non-polar covalent bonds.
An animal that finds its way by the mechanism known as piloting is using ____
a. familiar landmarks to guide his journey b. the sun's position in the sky to orient himself c. both the sun's position and a mental map d. the Earth's magnetic field to orient himself e. another animal to lead the way as he learns the route
Thermoregulation in ectotherms can be accomplished by all of the following except:a
migration. b. basking. c. burrowing. d. seasonal variations in the external environment. e. increasing their metabolism.
Which of the following is the correct explanation for the data?
(A) At higher osmolarity, lower rates of contraction are required because more salt diffuses into the paramecia. (B) The contraction rate increases as the osmolarity decreases because the amount of water entering the paramecia by osmosis increases. (C) The contractile vacuole is less efficient in solutions of high osmolarity because of the reduced amount of ATP produced from cellular respiration. (D) In an isosmotic salt solution, there is no diffusion of water into or out of the paramecia, so the contraction rate is zero.