Mammals and birds are descendents of reptiles, but are not included within the taxon Reptilia. As a taxon Reptilia is
A. polyphyletic.
B. polygenetic.
C. paraphyletic.
D. a supergroup.
E. a kingdom.
C. paraphyletic.
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Why did the dinosaurs become extinct?
A. A meteorite or comet crashed into the Earth, causing smoke and ash that blocked the sun and caused death of the plants that were food for dinosaurs. B. The cycads upon which dinosaurs fed were purgatives and when they declined the dinosaurs, unable to digest flowering plants, died of constipation. C. Increasing carbon dioxide levels produced climates too hot for the incubation of their eggs. D. Increase in the number of ferns produced so many spores in the atmosphere that dinosaurs suffered from lung irritation. E. The pollen produced by the rise in flowering plants produced allergenic responses in dinosaurs.
When salt dissolves in water, the water molecules form ____ around the Na+ and Cl- ions
a. covalent bonds b. hydration layers c. nonpolar interactions d. membranes e. ionic bonds
An atom with more protons than electrons is called a(n) __________. Fill in the blank(s) with the appropriate word(s)
The G1-to-S checkpoint, one of the cyclins has reached a concentration great enough to complex with one of the CDKs to initiate DNA synthesis. Which cyclin and which CDK are the ones involved?
a. cyclin G1/S and CDK2 b. cyclin G1/S and CDK1 c. cyclin S and CDK2 d. cyclin S and CDK1