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TLS Online TPP Program

#Question id: 101

You have two bottles, each of which contains a white, crystalline substance. Your lab director tells you that one contains lactose and the other sucrose. Your job is to determine which bottle contains which sugar. Which procedure would you use?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. Test both for solubility in water. Sucrose is very soluble; lactose is only minimally soluble.

  2. Test for the ability to reduce Ag+. Only lactose will react.

  3. Dissolve each in water and record the pH. Lactose is far more acidic than sucrose.

  4. React each with bromine (Br2) water. Only sucrose will react.

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TLS Online TPP Program

#Question id: 12911

#Unit 13. Methods in Biology

Match the following:
A. DNA polymerases              i. Alkaline phosphatase        a.RNA-dependent DNA polymerase, used in cDNA synthesis
B. Reverse transcriptase        ii. T4 DNA ligase                    b. Thermostable DNA polymerase used in PCR
C. Ligases                                 iii.  AMV-RT                            c. Removes 5′-phosphates from DNA and RNA
D. Phosphatases                     iv. Taq DNA pol                      d. Links 5′-phosphate and 3′-hydroxyl ends via phosphodiester bond
TLS Online TPP Program

#Question id: 9616

#Unit 9. Diversity of Life Forms

Which mutation should least require realignment of homologous regions of a gene that is common to several related species?
TLS Online TPP Program

#Question id: 18715

#Unit 13. Methods in Biology

Isoschizomers are defined as
TLS Online TPP Program

#Question id: 11726

#Unit 6. System Physiology – Plant

SPY acts upstream of GAI and RGA in the Gibberellin signal transduction chain, what is the role of SPY?
TLS Online TPP Program

#Question id: 1180

#Unit 4. Cell Communication and Cell Signaling

In which of the following double-mutant flies will R7 photoreceptors develop normally?