TLS Online TPP Program

#Question id: 28240


partitioning occurs at cytokinesis, factors determining cell fate are either selectively partitioned to one daughter cell or shared evenly between daughter cells, so these type of regulation called___

#Unit 5. Developmental Biology
  1. regulation by post-translational mechanism
  2. regulation by cytoplasmic determinants
  3.  regulation by transcription
  4.  regulation by epigenetic control
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TLS Online TPP Program

#Question id: 382

#Unit 1. Structure and Function of Biomolecules

The molar ratio of sodium acetate to acetic acid in a buffer solution with a pH OF 5.76 is 10:1. Assuming the total buffer concentration is 2.2 X 10-2 mol/L, how many grams of sodium acetate (m.w. 82) and how many grams of acetic acid (m.w. 60) should be used in preparing a litre of the solution?

TLS Online TPP Program

#Question id: 383

#Unit 1. Structure and Function of Biomolecules

Three buffers are made by combining a 1 M solution of acetic acid with a 1 M solution of sodium acetate in the ratios shown below

1 M acetic acid              

1 M sodium acetate  

Buffer 1: 10 mL

 90 mL

Buffer 2: 50 mL

50 mL

Buffer 3: 90 mL

10 mL

 Which of these statements is true of the resulting buffers?

TLS Online TPP Program

#Question id: 384

#Unit 1. Structure and Function of Biomolecules

A solution was prepared by dissolving 0.02 moles of acetic acid (HOAc; pKa = 4.8) in water to give 1 liter of solution. What is the pH? To this solution was then added 0.008 moles of concentrated sodium hydroxide (NaOH). What is the new pH? (In this problem, you may ignore changes in volume due to the addition of NaOH).

TLS Online TPP Program

#Question id: 385

#Unit 1. Structure and Function of Biomolecules

In which reaction below does water not participate as a reactant (rather than as a product)?

TLS Online TPP Program

#Question id: 386

#Unit 1. Structure and Function of Biomolecules

Which of the following properties of water does not contribute to the fitness of the aqueous environment for living organisms?

TLS Online TPP Program

#Question id: 387

#Unit 1. Structure and Function of Biomolecules

For a weak acid with a pKa of 6.0, What would be the ratio of acid to salt at pH 5.