Drosophila melanogaster is a suitable research subject for developmental genetics studies because:a

the fly is large enough for many surgical procedures.
b. many developmental control genes observed in the fly are also present in humans.
c. flies are not subject to genetic mutations.
d. while flies are small and easy to house, they require specialized and expensive dietary requirements.
e. the control of fly development is unique and unrelated to human development.


b

Biology & Microbiology

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usually organized around five rays, or "arms."

a. Hemichordata b. Echinodermata c. Cnidaria d. Arthropoda e. Chordata

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Smooth muscles

a. are not striated. b. have spindle-shaped cells. c. are found in the walls of hollow structures such as blood vessels and the stomach. d. are involuntary. e. include all of these descriptions.

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Recessive traits are expressed only in the homozygous state. Indicate whether the statement is true or false

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Immunization for ________ may reduce the incidence of otitis media and sinusitis.

A. Mycoplasma pneumoniae B. Mycobacterium tuberculosis C. Propionibacterium acnes D. Corynebacterium diphtheriae E. Streptococcus pneumoniae

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