Red-green color blindness is an X-linked recessive trait. Two normal-vision parents have a color-blind
son. Indicate the genotype and phenotype of each parent and the son. What will be an ideal response?
father CY, mother Cc, son cY
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What type of interaction is directly responsible for the formation of secondary structure?
A) peptide bonds between adjacent amino acids B) peptide bonds between nonadjacent amino acids C) hydrogen bonds between sections of the polypeptide backbone D) hydrogen bonds between side chains of amino acids
What is ethylene?
a. a food source for the developing embryo b. a ripening hormone c. a substance to discourage animals from eating fruit d. a type of nectar
Answer the following statements true (T) or false (F)
1.A graded potential allows for variable, rather than all-or-none responses, in neurons. 2.During an action potential, sodium ions pour into the cell. 3.The purpose of the nodes of Ranvier is to start nerve impulses. 4.A nerve impulse does not spread backwards because of a refractory period in which the membrane reestablishes its resting potential and cannot generate another action potential. 5.The reason that we can tell light from sound is because different neurons transmit different stimuli.
The limnetic zone is the shallow-water area along the shore of a lake or pond
____________________ Indicate whether the statement is true or false.