The "big bang" refers to
A. an event marking the beginning of the universe.
B. the extinction of the dinosaurs.
C. the inevitable end of the universe.
D. the collision of the first galaxies forming the universe as it is today.
E. the inevitable death of large stars.
Answer: A
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If an operon is regulated by ____ control, genes are ____ by a regulatory protein called a ____
a. positive; on unless they are switched off; repressor b. negative; off unless they are switched on; repressor c. negative; on unless they are switched off; repressor d. positive; off unless they are switched on; repressor e. positive; on unless they are switched off; activator
A fruit, such as a strawberry, that develops from tissues of the receptacle as well as the ovary would be considered
a(n) ____.
a. aggregate fruit b. accessory fruit c. multiple fruit d. simple fruit e. compound fruit
A small Dutch population settled in South Africa in the 17th century and became known as Afrikaners. By chance, a
few Dutch settlers carried the gene for Huntington’s disease. Today, Huntington’s disease occurs at a relatively high frequency in this population. This is an example of ____.
a. the bottleneck effect b. the founder effect c. gene flow d. artificial selection e. natural selection
Because there are so many HLA allele combinations, it is rare to find unrelated individuals with the same HLA
halplotypes. a. True b. False