Practice Questions

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

Test both for solubility in water. Sucrose is very soluble; lactose is only minimally soluble.
Test for the ability to reduce Ag+. Only lactose will react.
Dissolve each in water and record the pH. Lactose is far more acidic than sucrose.
React each with bromine (Br2) water. Only sucrose will react.

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TLS Online TPP Program

#Question id: 15960

#Unit 12. Applied Biology

Protoplast suspension recovered after a treatment with a fusion inducing agent__

TLS Online TPP Program

#Question id: 31388

#Unit 2. Cellular Organization

How does the low pH of lysosomes protect the rest of the cell from lysosomal enzymes in case the lysosome breaks?

TLS Online TPP Program

#Question id: 12318

#Unit 10. Ecological Principles

The evolution of mating systems is most likely affected by

TLS Online TPP Program

#Question id: 1986

#Unit 4. Cell Communication and Cell Signaling

The following events occur when a mammalian immune system first encounters a pathogen. Which shows the correct sequence in which they occur?

I. Pathogen is destroyed.

II. Lymphocytes secrete antibodies.

III. Antigenic determinants from pathogen bind to antigen receptors on lymphocytes.

IV. Lymphocytes specific to antigenic determinants from pathogen become numerous.

V. Only memory cells remain.

TLS Online TPP Program

#Question id: 27066

#Unit 1. Molecules and their Interaction Relevant to Biology

Determine R and S Configurations On A Fischer Projection given below