Which of the following is NOT an outcome of neurulation?
A. establishment of cells that will form future pigment cells and certain facial bones
B. establishment of the central nervous system
C. establishment of the neural crest
D. establishment of the archenteron
E. establishment of somites
D. establishment of the archenteron
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Most eukaryotic cells contain mitochondria, but a few single-celled eukaryotic organisms found in oxygen-free environments do not
Which of the following observations led biologists to reject the hypothesis that these mitochondria-free eukaryotes evolved BEFORE the endosymbiotic event that established mitochondria in other eukaryotes? A. All eukaryotes exhibit some sort of energy utilization. B. Some eukaryotes don't have mitochondria, they have chloroplasts instead. C. The nuclear genome of these mitochondria -free eukaryotes contains relics of mitochondrial genes. D. All eukaryotes have remnant chloroplast genes.
Which trait of ferns makes them well adapted to both forest floors and inside buildings?
a. ability to grow in sandy soil b. preference for dry climates c. tolerance for low light conditions d. a pleasant smell resembling licorice
Which of the following should prevent a grass seedling shoot from bending toward light?
a. removing the shoot tip b. placing a translucent cap on the shoot tip c. placing an opaque cap on the shoot tip d. either removing the shoot tip or placing a translucent cap on the shoot tip e. either removing the shoot tip or placing an opaque cap on the shoot tip
Twin, adoption, and family studies show that obesity has a heritability that averages close to ____
a. 0.1 b. 0.3 c. 0.5 d. 0.7 e. 0.9