The sequence of amino acids in a protein is its ________ structure.
A. hepternary
B. tertiary
C. quaternary
D. primary
E. secondary
Answer: D
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As climate changes because of global warming, plant species' ranges in the northern hemisphere may move northward. The trees that are most likely to avoid extinction in such an environment are those that _____
A) have seeds that are easily dispersed by wind or animals B) have thin seed coats C) produce well-provisioned seeds D) have seeds that become viable only after a forest fire E) disperse many seeds in close proximity to the parent tree
A very rapid kind of communication that works at a distance and in the dark is
A. chemical communication. B. tactile communication. C. auditory communication. D. visual communication.
Amphibians are not completely free to live on dry land because
A. their food organisms live in water. B. their ancestors were fish. C. their reproduction depends on water. D. they obtain oxygen from water through gills. E. they can escape from predators by jumping into the water.
The epidermis is made up of epithelial cells which are held tightly together side by side to prevent pathogens from entering the body and to prevent unnecessary water loss. What type of junction holds epithelial cells together to achieve this function?
A) tight junction B) communicating junction C) gap junction D) anchoring junction