Pair-rule genes
A. are activated by segment polarity genes
B. are activated by gap genes
C. are expressed in alternating stripes
D. are activated by pair-rule genes and by maternal effect genes
E. are activated by gap genes and expressed in alternating stripes
E. are activated by gap genes and expressed in alternating stripes
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Which of the following is not true regarding the history of life on Earth?
A. The history of planet Earth includes alternations between colder periods ("icehouses") and warmer periods ("greenhouses") on the surface of the planet. B. The rise of more complex organisms such as eukaryotes has resulted in a reduction in diversity of more "primitive" organisms such as bacteria. C. There have been repeated incidents of mass extinction in the history of the planet in which species diversity has been reduced by 50% or more.
What is the difference between the blood types, A, B, and O?
A. A and B individuals have carbohydrate trees on the surface of red blood cells. O individuals do not have carbohydrate trees. B. For each blood type, A, B, and O, there is a different sugar attachment enzyme produced. C. A and B individuals have different modifications made to their carbohydrate tree. O individuals have no modifications made to their carbohydrate tree. D. The glycosyl transferase gene has a different mutation in A individuals than in B individuals. O individuals have no mutations in the glycosyl transferase gene. E. Two of these answers are correct. The glycosyl transferase gene mutations in A and B individuals prevent the removal of carbohydrate trees from the cell surface. O individuals have no mutations and therefore have no carbohydrate trees on the red blood cell surface.
The ________ are of critical ecological importance because most are endomycorrhizal symbionts of vascular plants.
A. Zygomycota B. Basidiomycota C. Deuteromycota D. Glomeromycota
The most developed sense in humans is
a. hearing. b. vision. c. taste. d. smell.