"Since every cell in this patient's body has the same genetic change, it is most likely that . . ." 

A. he acquired this change from one of his parents.
B. he was exposed to mutagenic agents.
C. his mother was the only source of the mutant gene.
D. All of the choices are true.


A. he acquired this change from one of his parents.

Biology & Microbiology

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Which of the following is not an example of symbiotic nitrogen fixation?

A. Anabaenea with a water fern B. Rhizobium with leguminous plants C. Azotobacter with certain photosynthetic protists D. Frankia with woody shrubs

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Referring to the illustration, what activates the cyclin/Cdk complex?


a. binding between them
b. target protein
c. kinase
d. cyclin/Cdk is not activated

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All organ systems in a human embryo have formed by ____

a. day 5 b. week 2 c. week 8 d. week 15 e. the 8th month

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Differentiate between the following specialized roots:A

prop root B. buttress root C. pneumatophore D. storage root E. photosynthetic root What will be an ideal response?

Biology & Microbiology