A compound that could not have been present in the early atmosphere, because it is quite reactive and
would have broken down organic molecules that were a necessary step in the origin of life on Earth, is:
a. oxygen.
b. sulfur dioxide.
c. hydrogen sulfide.
d. carbon dioxide.
e. sodium chloride.
A
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The genetic code is essentially the same for all organisms. From this, one can logically assume which of the following?
A) A gene from an organism can theoretically be expressed by any other organism. B) All organisms have experienced convergent evolution. C) DNA was the first genetic material. D) The same codons in different organisms translate into different amino acids. E) Different organisms have different types of amino acids.
Based on hierarchical classifications and features, which statement about humans is true?
a. Humans are deuterostomes. b. Humans are acoelomates. c. Humans are diploblasts. d. Humans are asymmetrical.
What seagoing technology changed the course of navigation methods by providing an accurate means to determine the longitude of a ship?
a. Sextant b. Celestial charts c. Chronometer d. GPS
Digestion of starches begins in the:a
mouth. b. stomach. c. duodenum. d. jejunum. e. large intestine