What is the explanation for the mass extinction episode that brought about the demise of the dinosaurs?
What will be an ideal response?
The Alvarez hypothesis suggested that dinosaurs went extinct when a large meteorite hit the earth and sent up a huge cloud of dust. Plant photosynthesis would have been inhibited for a long enough period to cause starvation of such large creatures as the dinosaurs. Evidence to support the Alvarez hypothesis was recently found when a large crater was found just off the coast of the Yucatán. Radio-dating of the Yucatán impact was 65 million years ago, the same time the dinosaurs went extinct.
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________ are the polysaccharide portion of some protein glycans, which are characterized by repeating disaccharide units.
Fill in the blank(s) with the appropriate word(s).
Bacteria that are spherical in shape are called?
The diaphragm, cervical cap, and sponge all prevent pregnancy by preventing ___________.
a. fertilaztion b. ovulation c. implantation d. all of these are correct.
Glucose is used as an energy source only when proteins and fats are not available.
Indicate whether the statement is true or false.