The lymphocytes that recognize and kill abnormal cells


Ans: Natural Killer Cells

Biology & Microbiology

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Describe the main structural characteristics of the four basic tissues.

(a) Epithelial tissue: (b) Connective tissue: (a) Muscle tissue: (b) Nervous tissue:

Biology & Microbiology

The nematocysts of cnidarians are produced within the:

a. cnidocytes. b. cnidocils. c. statocysts. d. mouths. e. pneumatocysts.

Biology & Microbiology

Which type of protist lives in the digestive tracts of termites and cockroaches playing a key role in cellulose digestion?

a. pathogenic plasmodia b. photosynthetic dinoflagellates c. anaerobic parabasalids d. enteric excavata

Biology & Microbiology

How many different amino acids are present in the human body to produce the infinite variety of enzymes and other necessary proteins?

A) 10 B) 20 C) millions D) an infinite variety

Biology & Microbiology