Which organ system includes the spleen, lymph nodes, and thymus?

a. circulatory system
b. endocrine system
c. nervous system
d. digestive system
e. lymphatic system


ANSWER: e

Biology & Microbiology

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The fact that cells of genetically uniform population do not have similar phenotypic attributes is called ________ heterogeneity.

A. population B. dissimilar C. quorum D. epigenetic

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Name two forms of recombination in bacteria

A) conjugation and transduction B) insertion and replication C) auxotrophic and prototrophic D) mixed and generalized E) lytic and lysogenic

Biology & Microbiology

A pheromone is a chemical signal secreted into the environment

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

The typical human male has 

A. 22 pairs of chromosomes. B. 22 pairs of chromosomes and two Y chromosomes. C. 22 pairs of chromosomes and one X and one Y chromosome. D. 23 X or 23 Y chromosomes.

Biology & Microbiology