Doubling the chromosomes of a sterile species hybrid with colchicine or cold shock is a method used to produce a fertile species hybrid called a ________
A) autoallopolyploid
B) (amphidiploid)
C) autoploid
D) allopolyploid
E) triploid
Answer: B
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Which statement summarizes the distinction between nonpolar and polar covalent bonds?
A. The difference in electronegativity of the atoms in a nonpolar covalent bond is very large. B. The electrons are more evenly and symmetrically distributed in orbit among atoms in a nonpolar covalent bond. C. The electrons are more evenly and symmetrically distributed in orbit among atoms in a polar covalent bond. D. Polar covalent bonds are formed when the atoms gain or lose electrons to bond and become oppositely charged ions.
Four of the five choices listed below are related by
their description of enzyme properties. Select the exception. a. specificity b. active sites c. activation energy d. substrate e. catalyst
Although all human beings have unique sets of DNA
sequences, about __________ percent of human DNA is the same for all humans. a. 50 b. 60 c. 75 d. 90 e. 99
Once a prophage is present in a bacterial genome, viral genes are reproduced every time the bacterium multiplies. Expression of viral genes, however, is inhibited by a repressor protein. Cell stress can induce the formation of proteases that degrade the repressor. What will result?
A. The bacterial genome will be denatured. B. The virus will enter the lysogenic cycle. C. The bacterium will reject the viral genes. D. The virus will enter the lytic cycle.