What keeps the trachea from collapsing?

A) Cilia B) Surface tension of water
C) Surfactant D) Semicircular rings of cartilage


D

Biology & Microbiology

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Biosynthetic reactions that require energy for the conversion of molecular subunits into larger molecules are called

A. kinetic energy. B. catabolic reactions. C. precursor molecules. D. anabolic reactions.

Biology & Microbiology

You sit next to Uncle Ed, an immunologist, at Thanksgiving dinner. "I'm a 'big eater'", he says, "just like the cells I study." What are the large cells that engulf pathogens that Uncle Ed works with? 

A. monocytes B. erythrocytes C. macrophages D. bacteriophages E. antibodies

Biology & Microbiology

Where is electricity made at a coal-fired power plant?

A- generator B- control room C- boiler D- colling tower F- silo

Biology & Microbiology

Describe the four stages of chemical and biological evolution.

What will be an ideal response?

Biology & Microbiology