One of the two strains of Streptococcus pneumoniae isolated in the 1920s was surrounded by a ____________________, giving it the ability to evade the immune system and cause pneumonia

Fill in the blank(s) with correct word


capsule

Biology & Microbiology

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As part of the inflammatory response, _____ engulf and destroy invading bacteria

a. histamines b. dead skin cells c. mast cells d. macrophages e. antibodies

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What structural component in skeletal and cardiac muscle conducts action potentials from the outer surface of the muscle fiber inside to the myofibrils?

A. actin B. tropomyosin C. troponin D. transverse tubule E. None of these.

Biology & Microbiology

Nearly all ________ are aquatic

A) crustaceans B) arachnids C) flatworms D) roundworms

Biology & Microbiology

What stimulates secretion of testosterone by Leydig cells?

A. FSH B. LH C. Testosterone D. Estradiol E. Progesterone

Biology & Microbiology