What percentage of the species that have inhabited the Earth are extinct?
a. 15%
b. 50%
c. 35%
d. 99%
e. 85%
d
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What is true of a life table? Select all that apply.
_____ It provides data on the number of individuals alive in a particular age class. _____ It often excludes males. _____ It uses a log scale to show general patterns of survival over time. _____ It often includes fertility rates for each age class.
Which scientist(s) discovered the basis for the base-pair rule, which states that the amounts of thymine and adenine are
always equal in all DNA molecules, as are the amounts of cytosine and guanine?
a. Watson and Crick b. Beadles c. Chargaff d. Franklin e. Pauling
The determination of the taxon to which an organism belongs is called ________.
A. classification B. identification C. taxonomy D. systematics
Nonprotein coding pieces of pre-mRNA that are removed during RNA splicing are called ________
A) introns B) exons C) SNPs D) promoters E) poly(A) tails