The molecule that prevents lung collapse by lowering the surface tension of the water film lining each alveolar sac is called:

TLS Online TPP Program

#Question id: 11543

#Unit 7. System Physiology – Animal

Hormone X activates the cAMP second messenger system in its target cells. The greatest response by a target cell would come from ________.

TLS Online TPP Program

#Question id: 13155

#Unit 2. Cellular Organization

Lysozyme is an enzyme that destroys bacterial cell walls. It does so by hydrolyzing the β(1→4) glycosidic linkages from N- acetylmuramic acid (NAM or MurNAc) to N- acetylglucosamine (NAG or GlcNAc) in cell wall peptidoglycans. The only functional groups in the immediate vicinity of lysozyme’s reactive center that have the required catalytic properties are the side chains of Glu 35 and Asp 52.

a- Glu perform reaction in its protonated state and Asp perform reaction in its deprotonated state. 

b- Glu perform reaction in its deprotonated state and Asp perform reaction in its protonated state. 

c- both in its protonated form

d- both in its deprotonated form 

Choose the correct option?

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#Question id: 23908

#Unit 1. Molecules and their Interaction Relevant to Biology

In initial environmental examination, the following are considered:

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#Question id: 11090

#Unit 7. System Physiology – Animal

An aviator is flying at 30,000 ft where the barometric pressure is 226 mm Hg. He is breathing 100% oxygen, his alveolar PCO2 is 40 mm Hg, and his alveolar water vapor pressure is 47 mm Hg. What is the alveolar PO2 of the aviator (in mm Hg)? (Assume that the respiratory quotient is equal to 1.)

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#Question id: 13175

#Unit 10. Ecological Principles

Which of the following biomes is characterized by a wet, mild winter and a warm, dry summer?