Describe the three steps of translation. What will be an ideal response?
ANSWER: Translation has three steps: initiation, elongation, and termination. Initiation begins when
mRNA binds to a small ribosomal subunit and the anticodon of the initiator tRNA carrying
the amino acid methionine pairs with the AUG codon of mRNA. During elongation, amino
acids are added to the growing polypeptide chain. Termination occurs when the ribosome
reaches a stop codon. Proteins called release factors bind to stop codons; then the
polypeptide, mRNA, and tRNA are released from the ribosome.
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has a disproportionately large effect on a community relative to its abundance
b. controls the prey species c. may increase or decrease the number of prey species in a community d. has a disproportionately large effect on a community relative to its abundance and may increase or decrease the number of prey species in a community e. has a disproportionately large effect on a community relative to its abundance, controls the prey species, and may increase or decrease the number of prey species in a community
The functional unit of the kidney is the
a. renal pelvis. b. ureter. c. cortex. d. nephron.
The letter “D” in the above figure represents which
teeth? a. incisors b. molars c. canines d. premolars e. none of these
In the lac operon in E. coli, a nonsense mutation in the ________ gene will result in a loss of ß-galactosidase activity in the cell
A) lacZ B) lacI C) lacY D) Both A and B E) All of these