The Eukarya split from the Archaea approximately:
A) 2.5 billion years ago.
B) 4 billion years ago.
D) 4 million years ago.
E) 2.5 million years ago.
Ans: A) 2.5 billion years ago.
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tRNA molecules are able to act as adapters between amino acids and mRNA during translation because:a
tRNA binds to ribosomes. b. tRNA can bind to both mRNA and an amino acid. c. tRNA anticodons bind to amino acids. d. tRNA is recognized by RNA polymerase. e. tRNA molecules bind to promoter sequences to initiate transcription.
When spread out and viewed with electron microscopy, an active rRNA gene looks like a
a. Star of David. b. Christmas tree. c. reindeer. d. Santa Claus.
Explain why oxytocin and prolactin are both necessary for nursing
What will be an ideal response?
A common first separation technique in 2D gels is isoelectric focusing. What property is isoelectric focusing taking advantage of?
A) size B) amino acid content C) the pH at which the overall charge is zero D) charge