From the cardiac pacemaker, the excitatory
signal travels to the
a. sinoatrial node.
b. atrioventricular node.
c. septum.
d. base of the ventricles.
e. aortic valve.
B
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Were dominant and recessive traits observed equally in both gametophytes and sporophytes of C-ferns? Expect about a 1:1 phenotypic ratio. How did you determine which character was dominant and which was recessive?
What will be an ideal response?
Which of the following could explain how 14 genes for globins, each specialized in their function (i.e., hemoglobin, myoglobin), arose in the genome?
A. misaligned crossover B. gene deletion C. gene mutation D. misaligned crossover and gene mutation E. misaligned crossover and gene deletion
How does the process of pollination increase the likelihood that a species of plant will survive?
A. Pollen provides food for bees. B. Pollination mixes genes from several plants. C. Pollinators become stronger by eating the pollen. D. Pollination provides insects with genetically diverse sperm.
Oral flora bacteria on the tooth surface
A. use fimbriae and slime layers to adhere. B. include streptococci that metabolize sucrose, produce sticky glucans, and form plaque. C. develop a biofilm. D. include lactobacilli and streptococci that ferment carbohydrates and produce acids that cause caries. E. All of the choices are correct.