If an F2 generation from a self-cross always yields offspring in a 3:1 phenotypic ratio, which of the following P crosses could have occurred?
A) aa × Aa B) AA × AA C) AA × aa D) aa × aa E) Aa × AA
Answer: C
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What do G-protein coupled, enzyme-linked, and ligand-gated ion channel receptors have in common?
A. They are all linked to protein kinase activation. B. They associate with protein bound to guanidine phosphates. C. They open ion channels. D. They bind similar hormones. E. They change their conformation when bound to a hormone.
. A severely injured animal is still able to defend itself due to the action of ____
a. dopamine b. endorphins c. endorphins d. acetylcholine e. GABA
It is considered healthy to have high levels of high-density lipoproteins (HDL). Why is this true?
A) HDL is important in making complete proteins. B) HDL moves cholesterol to the heart. C) HDL moves cholesterol to the liver for disposal. D) HDL is a form of saturated fat.
What is a nerve?
A) a bundle of neurons B) a chain of neurons C) a sensory synapse D) a series of impulses