Which of the following structures is found in a human eye, but not in an octopus eye?
A. Lens
B. Optic nerve
C. Retina
D. Blind spot
E. Cones
Answer: D
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Cristae are
A) types of genes. B) types of insects. C) membranous structures that are parts of mitochondria. D) bits of sugars in the Golgi apparatus.
Which statement about autotrophs is true?
a. Photoautotrophs are the most common ecosystem energy source. b. Chemoautotrophs depend on sunlight to generate energy. c. Photoautotrophs consist primarily of bacteria and archaea. d. Chemoautotrophs are typically found in grazing food webs.
Peahens prefer to mate with peacocks that have
the brightest and largest tail displays. The peacock’s tail is, in and of itself, a disadvantage to the males. It is large and cumbersome and the males are more easily caught by predators because of it. Given these facts, why isn’t the peacock’s tail selected against by natural selection?
a. peacocks lack the mutations to allow selection to work b. it is working- peacocks are slowly going extinct c. in spite of the disadvantage, peacocks with larger tails leave more offspring d. it is selected against but because a peahen gives birth to so many males, the population is not greatly affected e. this is one of those mysteries of biology
If a mutation prevents the formation of lignin, which
tissue will be most affected? a. vascular cambium b. parenchyma c. collenchyma d. sclerenchyma e. all of these