Of the following extremes, at which has life
NOT been found?
a. low pH.
b. high temperature.
c. high pressure.
d. high salinity.
e. it has been found at all of these.
E
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Any light-driven reaction that attaches phosphate to a
molecule is called __________. Fill in the blank(s) with the appropriate word(s).
Heinz Fraenkel-Conrat induced point mutations in the genes encoding coat proteins of TMV and looked for changes in the resulting proteins
By examining the effect of single-base changes in the mRNA on the amino acid sequence, Conrat proved that __________. A) the genetic code is overlapping B) the genetic code is nonoverlapping C) the genetic code is redundant D) there are 20 amino acids E) the genetic code is triplet
As a morula, the embryo consists of
A) a hollow ball of cells. B) a cluster of cells that are much larger than normal cells. C) cells that have different DNA content. D) a solid mass of cells, each the size of the zygote. E) three differentiated layers of cells.
Which of the following is not true about energy stored and released in cells?
A. The free energy stored in the phosphodiester bonds of ATP can be used to drive biosynthetic reactions of metabolism. B. ATP can be hydrolyzed to ADP and Pi and the energy released used to form chemical bonds. C. The hydrolysis of ATP results in a large negative change in the free energy. D. ATP can be hydrolyzed to AMP and PPi but the energy released is not used to form chemical bonds. E. All of these statements are true.