What is the difference between a nucleotide and a nucleoside?
A) Nucleotides are found in DNA, while nucleosides are found in RNA.
B) Nucleotides are involved in eukaryotic DNA replication, while nucleosides are used in bacterial DNA replication.
C) Nucleosides contain only deoxyribose sugars.
D) A nucleoside with a phosphate ester linked to the sugar is a nucleotide.
E) Nucleosides are purines, while nucleotides are pyrimidines.
D
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Magnetoreceptors ____
a. are well characterized and understood b. are known to rely on the mineral magnetite c. have been theorized to help many types of animals navigate huge distances in their annual migrations d. have been studied only in homing pigeons e. have been studied primarily in moths
All known species can be grouped into three
domains. What are they?
a. prokaryotes, bacteria, and eukarya. b. prokaryotes, archaea, and eukarya. c. plantae, bacteria, and archaea. d. bacteria, archaea, and eukarya. e. bacteria, archaea, and protista.
When did the Earth's crust form?
a. 2.9 billion years ago b. 3.2 billion years ago c. 4,600 million years ago d. 4.6 thousand years ago e. 12,000 years ago
Warming is predicted to be greatest
A) during winter months. B) during summer months. C) in the Southern Hemisphere. D) in the Pacific Ocean.