Which method of inserting DNA into cells is illustrated in Figure 8.1?
A. protoplast fusion
B. injection
C. electroporation
D. a gene gun
E. transduction
Answer: A
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Choose the true statements about the evolution of flower symmetry.
_____ Some radially symmetric flowers have ancestors with bilaterally symmetric flowers. _____ Having radially symmetric flowers is ancestral to having bilaterally symmetric flowers. _____ All cases of flowers with bilateral symmetry involve the CYCLOIDIA (CYC) gene. _____ Bilateral symmetry in some flowers is a homoplastic character derived through convergent evolution.
Which of the following is a correct statement?
a. Rhodopsin is active in the dark and thereby allows the release of neurotransmitters from the synaptic terminal in the absence of light. b. Rhodopsin is inactive in the dark and thereby inhibits the release of neurotransmitters from the synaptic terminal unless light is present. c. Rhodopsin is active in the dark and thereby inhibits the release of neurotransmitters from the synaptic terminal in the absence of light. d. Rhodopsin is inactive in the dark and thereby allows the release of neurotransmitters from the synaptic terminal unless light is present. e. Rhodopsin's activity is different between rods and cones, but leads always to increasing amounts of neurotransmitters being release.
The accumulation of excess fluids in afflicted tissues and serous cavities is called _____.
Fill in the blank(s) with the appropriate word(s).
The pitch of sound is determined by the
A. number of sound waves. B. frequency of sound waves. C. intensity of sound waves. D. size of sound waves.