Over the past 600 million years, the overall trend in the number of species has been ________
Fill in the blank(s) with correct word
increasing
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Suppose that an induced mutation removes most of the end of the UTR of an mRNA. What is most likely to happen?
A) Removal of the UTR will have no effect because the exons are still maintained. B) Removal of the UTR also removes the 5' cap and the mRNA will quickly degrade. C) The UTR will duplicate and one copy will replace the end. D) The first exon will not be read because I1 will now serve as the UTR.
The Burgess Shale formation in western Canada, with fossils dating to about ____ years ago, includes
a wide variety of animal fossils such as Hallucingenia and Opabinia.
a. 4 billion b. 8,000 c. 530 million d. 1.2 billion e. 78 million
In Africa and other parts of the world, malaria parasites can cause deadly illness. Individuals who are heterozygous for sickle-cell anemia can produce a resistance to the malaria infection. This is known as
A. heterozygote disadvantage. B. heterozygote advantage. C. polygenic inheritance. D. pleiotropy. E. homozygote advantage.
The pattern of fever shown in Figure 21.1 is most commonly seen with
A. yaws. B. Lyme disease. C. lymphogranuloma venereum. D. syphilis. E. relapsing fever.