Which of the following terms refers to microorganisms that live in or on the body and cause harm?

A. commensals
B. mesophiles
C. thermophiles
D. pathogens
E. halophiles


Answer: D

Biology & Microbiology

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Dating to about 3.5 million to 3 million years ago, the famous fossil "Lucy," found in northern

Ethiopia, represents a member of which species?

a. Homo habilis b. Homo erectus c. Australopithecus africanus d. Australopithecus afarensis e. Homo neanderthalensis

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Most hormones produced in the anterior

pituitary

a. affect kidney functioning. b. are secreted in response to signals from the medulla oblongata. c. control the release of hormones from other endocrine glands. d. are steroid hormones. e. have their effect in the posterior pituitary

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With almost no exceptions, the nitrogen fixers are 

A. beans. B. green plants. C. insects. D. mammals. E. prokaryotes.

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Human sperm cells first arise in the _____

A) prostate gland B) vas deferens C) seminiferous tubules D) epididymis

Biology & Microbiology