The polarity of a water molecule is due to:
a. the greater number of hydrogen atoms relative to oxygen.
b. the uneven attraction of electrons to the oxygen atom.
c. the uneven attraction of electrons to the hydrogen atoms.
d. the uneven attraction of protons to the oxygen atom.
e. the number of neutrons in the nucleus.
B
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A student observes a wormlike organism crawling about on dead organic matter. Later, the organism sheds its outer covering. One possibility is that the organism is a larval insect (like a maggot)
However, it might be a member of the phylum ________, and one way to distinguish between the two possibilities is by looking for the presence or absence of ________. A) Platyhelminthes; a cuticle of chitin B) Nematoda; an alimentary canal C) Annelida; a body cavity D) Nematoda; a circulatory system E) Annelida; muscle in the body wall
Sea turtles are endangered, in part because of human encroachment on the beaches where they lay eggs. You are working with a team to help protect turtle nests and hatchlings from curious beachgoers. Someone suggests putting a fabric dome over each nest to keep people away. What is your response?
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Therapeutic cloning could be used for
a. replacing defective genes. b. producing missing factors. c. growing replacement human tissues and organs. d. genome identification. e. producing designer babies..
Which of the following have four-chambered hearts?
A) Fishes B) Spiders C) Birds D) Frogs