Proteins carry out much of the biochemistry of life, including DNA replication, but DNA stores the information needed to build correct proteins. Early life forms would have needed both proteins and DNA, but neither can exist without the other
The RNA world hypothesis is an appealing solution to this problem, because it states that ________. A) RNA can evolve into DNA by natural selection
B) proteins can store the information needed for their own synthesis
C) RNA is more chemically stable than DNA
D) nucleotides of RNA are chemically similar to amino acids
E) some RNA molecules both store information and catalyze chemical reactions
E
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Which of the rRNA molecules has proven the most useful in taxonomy/identification?
A. 5S B. 16S C. 23S D. 80S
The clavicle is attached on its medial end to the
a. vertebrae. b. sternum. c. intervertebral disks. d. sacrum. e. coccyx.
Which of the following is an organic molecule?
A. CaCO3 B. (BH)3(NH)3 C. NaCl D. C6H12O6
Certain prokaryotes can withstand drying and hotter temperatures because of their ability to form
A. organelles. B. plasmids. C. endospores. D. cell walls. E. flagella.