Which of the following might be expected to increase as a result of predation?
A. competition among prey species
B. the availability of resources and niches
C. prey population densities
D. niche divergence
E. extinction of prey species due to
competitive exclusion
B
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Since Watson and Crick described DNA in 1953, which of the following might best explain why the function of small RNAs (miRNAs) is still not well understood?
A) As RNAs have evolved since that time, they have taken on new functions. B) Watson and Crick described DNA but did not predict any function for RNA. C) The functions of small RNAs could not be approached until the entire human genome was sequenced. D) Ethical considerations prevented scientists from exploring this material until recently. E) Recent advances in technology and our understanding of how DNA is expressed have made this possible.
Mole percent (G+C) of DNA is useful for determining relatedness at the ________ level.
A. class B. genus C. kingdom D. None of the choices are correct.
What type of thinking is required?
What will be an ideal response?
Some migratory birds that fly during the day position themselves using the location of the Sun in conjunction with an
internal biological clock. This wayfinding mechanism is called ____.
a. solar migration b. landmark migration c. piloting d. navigation e. compass orientation