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
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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
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
A pheromone is a chemical signal secreted into the environment
____________________ Indicate whether the statement is true or false.
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.