The structural RNA of ribosomes is a
A. proenzyme.
B. gene.
C. codon.
D. pre-mRNA.
E. ribosomal RNA (rRNA).
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Question 2) Which of the following molecules contains the anticodon?
A. mRNA
B. rRNA
C. tRNA
D. DNA
E. None of these choices are correct.
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Question 3) Messenger RNA
A. is synthesized when a portion of a DNA molecule is transcribed.
B. directs the synthesis of DNA.
C. is not involved in the synthesis of proteins.
D. determines the sequence of nucleotides in the anticodons of tRNA.
E. directs the synthesis of centrioles in the cytoplasm.
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Question 4) The anticodon sequence GUA pairs with which of the following codons?
A. CAU
B. CAT
C. CTU
D. CTT
E. GUA
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Question 5) A DNA base sequence is A T G C C G. The sequence of bases in a strand of mRNA transcribed from this sequence of bases in DNA would be
A. U T C G G U.
B. U A C G G C.
C. T A G G G G.
D. T A C G G C.
E. A U G C C G.
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Question 6) Transcription
A. occurs at the ribosomes.
B. synthesizes RNA from DNA.
C. synthesizes DNA from RNA.
D. copies information from mRNA to tRNA.
E. requires three types of RNA.
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Question 7) Translation
A. takes place in the nucleus.
B. requires three types of DNA.
C. requires the pairing of codons on mRNA with anticodons on tRNA.
D. involves synthesis of RNA from DNA molecules.
E. requires replication of DNA.
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Question 8) What molecule(s) cause(s) a portion of a DNA molecule to unwind for transcription?
A. polyA tail
B. transcription factors
C. spliceosomes
D. RNA ploymerase
E. 7methylguanosine cap
(
Question 9) What is the only human cell with a flagellum?
A. red blood cells
B. macrophage (large, mobile white blood cell)
C. spermatozoa
D. columnar cells of small intestines
E. columnar cells of upper respiratory tract
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Question 10) Which of the following are ciliated cells?
A. red blood cells
B. macrophage (large, mobile white blood cell)
C. spermatozoa
D. columnar cells of upper respiratory tract
E. columnar cells of small intestines
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