Which of the following is an example of sympatric speciation?
A. two populations of salamanders that live on isolated islands and eventually become separate species, unable to interbreed
B. different breeds of dog, which live in different areas of the world, but are able to produce fertile offspring
C. a horse and a donkey, which may interbreed to produce a mule, which is sterile and unable to reproduce
D. two related plant species living in the same area that hybridize, then undergo chromosome doubling, which results in the creation of a third species of plant that is unable to reproduce with either of the two original species
E. three species that evolve from a common ancestral species due to reproductive isolation, and adaptation to different habitats
Ans: D. two related plant species living in the same area that hybridize, then undergo chromosome doubling, which results in the creation of a third species of plant that is unable to reproduce with either of the two original species
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Defend the statement “Photosynthesis is the most important biological process on the planet Earth.”
What will be an ideal response?
Which term most precisely describes the cellular process of breaking down large molecules into smaller ones?
A) catabolism (catabolic pathways) B) metabolism C) anabolism (anabolic pathways) D) dehydration
An E. coli culture that has been growing at 37°C is moved to 25°C. Which of the following changes must be made in its plasma membrane?
a. The number of phosphate groups must increase. b. The viscosity must increase. c. The number of saturated chains must increase. d. The number of unsaturated chains must increase. e. No changes are necessary
Choose the letter of the best match from the following:A. abscisic acidB. trichomesC. aquaporinD. endodermisE. stomaPore in plasma membrane that allows water movement.
Fill in the blank(s) with the appropriate word(s).