If peach trees growing in specific mild climates of the southern United States do not receive about 850 hours of
temperatures below 40 degrees, they will not produce flowers in the spring. This is explained by which of the following
terms?
a. photoperiodism
b. phototropism
c. senescence
d. vernalization
e. dormancy
ANSWER: d
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T4 genes are transcribed by host RNA polymerase, yet the transcription of T4 genes is carefully controlled so that groups of T4 genes are transcribed at specific times after infection. How is this accomplished?
A) Early T4 genes encode for proteolytic enzymes that destroy the host RNA polymerase. Subsequently a viral polymerase is created that transcribes the middle and late genes in the correct order. B) Early and middle T4 genes encode for proteins that modify the activity of sigma factors and host RNA polymerase to regulate the expression of T4 genes. C) Each group of T4 genes has a different promoter that indicates that order in which they should be transcribed in based on the affinity of the promoter for the host RNA polymerase. D) Rolling circle replication of the viral genome ensures that the genes are available for transcription in the correct order.
The cell wall component algin is
(a) found in the brown algae. (b) used in the production of ice cream. (c) used as a medium on which microorganisms are grown. (d) both a and b.
DNA is more stable than RNA for storing genetic information because ____
a. uracil needed for RNA synthesis is far less common than thymine needed for DNA synthesis b. RNA breaks more easily and accumulates more mutations than DNA does c. DNA is easier to build from its component molecules d. DNA requires less energy to construct than RNA does e. RNA molecules are longer than DNA molecules and thus more prone to breakage
Which of the following best describes the photosynthetic membranes of Chlorobia?
A. Accessory bacteriochlorophylls are located in the plasma membrane, but the reaction center bacteriochlorophyll is located in the chlorosomes. B. Accessory bacteriochlorophylls are located in the chlorosomes, but the reaction center bacteriochlorophyll is located in the plasma membrane. C. Accessory and reaction center bacteriochlorophylls are located in the chlorosomes. D. Accessory and reaction center bacteriochlorophylls are located in the plasma membrane.