Practice Questions

TLS Online TPP Program

#Question id: 2230

Which of these statements about the composition of biological membranes is false?

#Unit 2. Cellular Organization

In a given eukaryotic cell type (e.g., a hepatocyte), all intracellular membranes have essentially the same complement of lipids and proteins.
The carbohydrate found in membranes is virtually all part of either glycolipids or glycoproteins.
The plasma membranes of the cells of vertebrate animals contain more cholesterol than the mitochondrial membranes.
The ratio of lipid to protein varies widely among cell types in a single organism.

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TLS Online TPP Program

#Question id: 1629

#Unit 4. Cell Communication and Cell Signaling

Clonal selection occurs when antigen is encountered by:

TLS Online TPP Program

#Question id: 2896

#Unit 2. Cellular Organization

Different modification states of the residue Lys-9 on the tail of histone H3 could be interpreted to have different meanings. One example of how a histone modification can apparently influence a second modification present nearby is illustrated by the Drosophila HP1 protein. Which of the following statement is correct regarding this kind of epigenetic regulation?

TLS Online TPP Program

#Question id: 31384

#Unit 5. Developmental Biology

In drosophila, the third thoracic segment is transformed into another second thoracic segment due to:

TLS Online TPP Program

#Question id: 136

#Unit 1. Molecules and their Interaction Relevant to Biology

The amino acids in polypeptide chains which contain sulfur (S) are

TLS Online TPP Program

#Question id: 27409

#Unit 1. Molecules and their Interaction Relevant to Biology

What are the functions of Sphingosine-1- phosphate (S1P)