A codon is a three-base sequence of
A) mRNA that codes for an amino acid.
B) rRNA that codes for an amino acid.
C) tRNA that codes for an amino acid.
D) mRNA or tRNA that codes for an amino acid.
A) mRNA that codes for an amino acid.
A codon is a three-base sequence of mRNA that codes for an amino acid.
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Which of the following is an example of post-transcriptional control of gene expression?
A) the addition of methyl groups to cytosine bases of DNA B) the binding of transcription factors to a promoter C) the removal of introns and alternative splicing of exons D) gene amplification contributing to cancer E) the folding of DNA to form heterochromatin
Which type of fungus has been linked to deaths of wild frogs across the globe?
1.Chytrids
2.Glomeromycetes
3.Basidiomycetes
4.yeasts
All aerobic bacterial species have identical electron acceptors in their electron transport systems.
Answer the following statement true (T) or false (F)
The islets of Langerhans located in the ________ secrete both insulin and glucagon.
A. pituitary B. liver C. kidney D. hypothalamus E. pancreas