The last shared ancestor for today's cell types is thought to have arisen about _____ years ago.
A. 5 million
B. 2 million
C. 3 billion
D. 4 billion
E. 6 billion
C. 3 billion
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Today, evolutionary biologists view speciation as a ____, and instead study the ____ of speciation using classical and genomic approaches.
a. single event; products b. process; products c. product; process d. product; events e. single event; process
In an evolutionary context, ________ structures do not currently have a function in present-day organisms
Fill in the blank(s) with correct word
In the genetic code, 61 of the codons specify amino acids and three codons are stop codons
However, according to the wobble hypothesis, a minimum of 31 tRNAs (excluding the initiator) are required to recognize 61 codons. What is the wobble hypothesis? Include in your answer the allowed base pairing scheme between codon and anticodon for the base inosine in the first position of the anticodon. What will be an ideal response?
The water potential of a flaccid cell you are studying is ?1.5. What is its solute potential?
A. 0.5 B. ?0.5 C. ?1.5 D. 1 E. 1.5