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TLS Online TPP Program

#Question id: 11371

Which statement about gram-negative bacteria is correct?

#Unit 9. Diversity of Life Forms
  1. Penicillins are the best antibiotics to use against them.
  2. They often possess an outer membrane containing toxic lipopolysaccharides.
  3. Their chromosomes are composed of DNA tightly wrapped around large amounts of histone proteins.
  4. Their cell walls are primarily composed of peptidoglycan
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TLS Online TPP Program

#Question id: 30697

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is true regarding Plasmalogen and Platelet-activating factor

a. The head group of Plasmalogen – ethanolamine
b. The head group of Plasmalogen – choline
c. The head group of Platelet-activating factor – ethanolamine
d. The head group of Platelet-activating factor – choline
TLS Online TPP Program

#Question id: 31014

#Unit 4. Cell Communication and Cell Signaling

If the insulin concentration rises fivefold to 2.5 × 10−11 M, as it does after a meal, and the Kd for binding of insulin to its receptor on liver cells, 1.4 × 10−10 M (0.14 nM). What fraction of insulin receptors with bound insulin? 
TLS Online TPP Program

#Question id: 31015

#Unit 4. Cell Communication and Cell Signaling

A ligand binds two different receptors with a Kd value of 10−7 M for receptor 1 and a Kd value of 10−9 M for receptor 2. For which receptor does the ligand show the greater affinity?
TLS Online TPP Program

#Question id: 31016

#Unit 4. Cell Communication and Cell Signaling

Epinephrine binding to its receptor stimulates:
TLS Online TPP Program

#Question id: 31017

#Unit 4. Cell Communication and Cell Signaling

When the signaling molecules are synthesized and secreted by signaling cells, transported through the circulatory system and finally act on target cells distant from their site of synthesis, called as:
TLS Online TPP Program

#Question id: 31018

#Unit 4. Cell Communication and Cell Signaling

Same ligand can induce different cells to respond in a variety of ways, often in a manner that coordinates the overall response of the organism. This property is known as: