External fertilization
A. occurs in amphibians.
B. often leaves fertilized eggs susceptible to predation.
C. involves the release of eggs and sperm into a body of water.
D. requires specialized behavior.
E. All of these statements are correct.
E. All of these statements are correct.
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The destruction or removal of all viable organisms is called
A. antisepsis. B. sterilization. C. sanitization. D. disinfection.
Woolly mammoths have been extinct for about 10,000 years, but we occasionally find one that has been preserved in Siberian permafrost. Resurrecting these huge elephantlike mammals may be possible by cloning DNA isolated from such frozen remains. Researchers are now studying the DNA of a remarkably intact baby mammoth recently discovered frozen in a Siberian swamp. What are some of the pros and
cons, both technical and ethical, of cloning an extinct animal? What will be an ideal response?
Which statement is true?
1.The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. 2.Adenine always pairs up with guanine in DNA, and cytosine always teams up with thymine. 3.Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. 4.When adenine base pairs with thymine, they are linked by three hydrogen bonds. 5.In the DNA of all species, the amount of cytosine never equals the amount of guanine.
This is another class of intermediate filaments found in epithelial cells:
A. keratin B. myosin C. tubulin D. amino acids E. actin