Which of the following is a nitrogen-fixing bacterium that forms associations with the roots of plants?

A. anaerobic Bacillus species
B. Clostridium species
C. Rhizobium species
D. Azotobacter species
E. cyanobacteria


Answer: C

Biology & Microbiology

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A stroke may occur when

a. a vessel in the brain ruptures. b. a vessel in the heart ruptures. c. a vessel in the brain is blocked by a clot. d. a vessel in the heart is blocked by a clot. e. a vessel in the heart ruptures, and a vessel in the brain is blocked by a clot

Biology & Microbiology

Which behavior is an example of a fixed action pattern?

A) the imprinting of baby goslings on their mother B) habituation in the cnidarian Hydra C) the way female digger wasps find their nests D) the way a greylag goose retrieves an egg that has rolled out of the nest

Biology & Microbiology

The Glutamate Hypothesis was proposed by an observation of PCP intoxication. PCP blocks (A)______ receptor, thus it inhibits (B)_____ influx. The PCP intoxication is accompanied by (C)___________ like symptom.

a. (A) NMDA (B) Na+ and Ca2+ (C) schizophrenia b. (A) NMDA (B) Na+ and Ca2+ (C) major depression c. (A) AMPA (B) Na+ (C) schizophrenia d. (A) AMPA (B) Na+ (C) major depression

Biology & Microbiology

Tissue fluid leaving the arterial end of the capillary is balanced by tissue fluid entering the venous end of the capillary.

Answer the following statement true (T) or false (F)

Biology & Microbiology