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TLS Online TPP Program

#Question id: 20324

What is the main difference between Gram positive and Gram-negative quorum sensing mechanism?

#Unit 4. Cell Communication and Cell Signaling
  1. Gram-negative bacteria use mainly peptides while Gram-positive bacteria use predominantly N-acyl homoserine lacton (AHL) molecules 
  2. Gram-negative bacteria use predominantly N-acyl homoserine lacton (AHL) molecules while Gram-positive bacteria use mainly peptides.
  3. Gram-negative bacteria use mainly peptides while Gram-positive bacteria use predominantly autoinducer-1, AI-1.
  4. Gram-positive bacteria is more resistance to antibiotics than Gram- negative.
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TLS Online TPP Program

#Question id: 2981

#Unit 2. Cellular Organization

For the nuclear envelope to be broken down as cells go from prophase to prometaphase during mitosis, the nuclear lamina has to be disassembled. Which of the following statement is incorrect?
TLS Online TPP Program

#Question id: 4158

#Unit 3. Fundamental Processes

What is a reasonable number of nucleotides in a tRNA molecule?
TLS Online TPP Program

#Question id: 1286

#Unit 4. Cell Communication and Cell Signaling

Syndecans are cell-surface proteoglycans that:

a. bind to collagens.

b. bind to multi-adhesive matrix proteins.

c. anchor cells to the extracellular matrix.
TLS Online TPP Program

#Question id: 5534

#Unit 5. Developmental Biology

In meroblastic cleavage, cleavage happens only in the
TLS Online TPP Program

#Question id: 379

#Unit 1. Molecules and their Interaction Relevant to Biology

A compound has a pKa of 7.4. To 100 mL of a 1.0 M solution of this compound at pH 8.0 is added 30 mL of 1.0 M hydrochloric acid. The resulting solution is pH: