The figure represents tRNA that recognizes and binds a particular amino acid (in this instance, phenylalanine). Which codon on the mRNA strand codes for this amino acid?
a. UGG
b. UUC
c. GUA
d. CAU
e. GUG
Ans: b. UUC
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Which of the following is not true of RNA synthesis by RNA polymerase?
A. RNA synthesis is less processive during elongation than during initiation. B. Synthesis begins with the polymerase binding two rNTP molecules. C. The polymerase frequently releases the nascent transcript before it reaches 8–10 nucleotides in length. D. The addition of an rNTP to a growing transcript is a magnesium ion-dependent reaction. E. All of the choices given are true.
Which proteins are encoded by genes that code for the first mRNAs transcribed in Drosophila embryos?
A. Morphogen proteins B. Caudal and Hunchback proteins C. Dorsal proteins D. Gap and Pair-rule proteins E. Bicoid and Nanos proteins
A major distinguishing feature between monocot and eudicot stems is the organization of the
A. epidermis. B. conducting system. C. secondary tissues. D. vascular tissue. E. ground tissues.
A type of cofactor would be
A. metallic ions. B. ribozymes. C. active sites. D. substrates. E. vitamins.