According to Oparin's theory for the origin of life, the prebiotic atmosphere:
A) already contained some primitive RNA molecules.
B) basically was very similar to the atmosphere of today.
C) contained many amino acids.
D) had an abundance of methane, ammonia, and water.
E) was rich in oxygen.
Ans: D) had an abundance of methane, ammonia, and water.
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Your colleague is studying a newly discovered organism. She is becoming increasingly convinced that the organism is an arthropod. You find that you must respectfully disagree when you note that the organism has a set of distinctly nonarthropod characteristics. The features that cause you to exclude the organism from the arthropod grouping are
A. jointed legs, ecdysis, and an exoskeleton. B. antennae, six legs, and mandibles. C. compound eyes, book lungs, and a hemocoel. D. Malpighian tubules, ommatidia, and tagmata. E. pseudocoel, closed circulatory system, and ventral heart.
As a result of fermentation, cells produce ____
a. ADP b. NADH c. FAD d. O2 e. NAD+
The smallpox vaccine uses the ________ virus.
A. smallpox B. variola C. human herpesvirus 6 D. vaccinia E. herpes simplex
Angiosperms are unique among plants because they produce ________
Fill in the blank(s) with correct word