Birds are classified as
A. reptiles.
B. mammals.
C. amphibians.
D. fishes.
E. invertebrate chordates.
Answer: A. reptiles.
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Aerobic bacteria most likely evolved ____
a. directly from early protocells b. around hydrothermal vents c. later than cyanobacteria d. in a prebiotic soup e. through the process of endosymbiosis
In transcription, RNA polymerase binds to a(n) _____________________ sequence near a gene, and then assembles a
strand of RNA.
Fill in the blank(s) with the appropriate word(s).Which of the following is noted when comparing DNA and RNA?
A) Adenine pairs with different bases in DNA and RNA. B) Thymine pairs with different bases in DNA and RNA. C) No sugar is present in either molecule. D) Hydrogen bonding is important only in DNA. E) Only DNA has a backbone made up of sugars and phosphates.
The oldest widely accepted evidence of animals is trace fossils dating to the final period of the Precambrian (635-541 million years ago) known as
A. Devonian. B. Proterozoic. C. Cambrian. D. Jurassic. E. Ediacaran.