Which molecule acts as a retrograde messenger at many synapses?

a. GABA
b. glycine
c. serotonin
d. substance P


e. nitric oxide


e

Biology & Microbiology

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ATP-binding cassette transport systems have high substrate affinity and thus help microorganisms survive in low nutrient environments

Indicate whether the statement is true or false.

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Considering two species of birds, which of the

following is a derived character?

a. four limbs b. a bony skeleton c. egg production d. feathers e. two eyes

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Which of the following problems is not associated with pregnancy?

A. incontinence B. gastrointestinal reflux C. lordosis D. impotence E. lower back pain

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Thermodynamics

What will be an ideal response?

Biology & Microbiology