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#Question id: 343


Assume that acid rain has lowered the pH of a particular lake to pH 5.0. What is the hydroxide ion concentration of this lake?

#SCPH01 Biochemistry
  1. 1 × 10^-9 mol of hydroxide ions per liter of lake water

  2. 1 × 10^-5 mol of hydroxide ions per liter of lake water

  3. 5.0 M hydroxide ion

  4. 5.0 × 10^-5 mol of hydroxide ions per liter of lake water

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TLS Online TPP Program

#Question id: 12930

#SCPH28 | Zoology

Name the library that represents only the mRNA from a particular cell or tissue at a specific point in time 

TLS Online TPP Program

#Question id: 4343

#SCPH06 I Botany

Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome. If a researcher moves the repressor gene (lacI), along with its promoter, to a position at some several thousand base pairs away from its normal position, which of the following results would be expected?

TLS Online TPP Program

#Question id: 17196

#SCPH28 | Zoology

What happens when the stressor remains during the GAS?

TLS Online TPP Program

#Question id: 16131

#SCPH01 Biochemistry

You are studying regulation of the yeast enzyme glutamine synthetase (GS), which is encoded by the GLN1 gene. You have isolated two mutants, designated gln2– and gln3–, that give decreased GS activity. Mating of either gln2– or gln3– haploids to wild type produces heterozygous diploids that show normal amounts of GS expression. When you cross either a gln2– or gln3– haploid to a gln1– strain the resulting diploids show normal expression of GS.              
 How many units of ß-galactiosidase would you expect to be expressed from deletion 4 in a gln2– mutant?

TLS Online TPP Program

#Question id: 1081

#SCPH28 | Zoology

Which of the following is a type of local signaling in which a cell secretes a signal molecule that affects neighboring cells?