15. A DNA molecule is composed of units known as nucleotides. A nucleotide may c
ID: 253198 • Letter: 1
Question
15. A DNA molecule is composed of units known as nucleotides. A nucleotide may contain a(n): A. nitrogen-containing base. B. five-carbon (pentose) sugar. C. phosphate group. D. adenine or thymine E. all of the above 16. What base pairing is correct for mammalian DNA? A. AATCGATG TTTGCTAC TTACGCGA AATGCGCT C. GCTCGATG CTGGCTAC D. CCATTCGA GGUAAGAU E. TTTAAGCG AAATACCc B. 17. DNA polymerase, telomerase, and RNA polymerase are all different types of A. enzymes B. nucleic acids C. carbohydrates D. lipids E. nucleotides 18. How many codons are in the following sequences of nucleotides AAAUGcUcGUGUGGU? A. 9 B. 12 C. 4 ? 19. Within eukaryotic genes are sections of information calledthat will be removed from the messenger RNA strand prior to it leaving the nucleus. A. exons B. introns and exons C. RNA polymerases D. promoter sequences E. introns 20. A messenger RNA molecule of eukaryotic cells is made up of how many different strands? A. 1 B. 2 C. 3 D. 4 E. none, because RNA is not a polymer 21. In eukaryotes, the portion of a gene that is translated into protein is known as a(n): A. intron. B. anticodon. C. exon. D. genetron E. both an exon and an intron.
Explanation / Answer
Answer:
15). E. All of the above
Explanation:
Nucleotide = nitrogen base (Adenine or Thymine or Guanine or Cytosine) + phosphate + deoxyribose sugar
16). B). TTACGCGA
AATGCGCT
Explanation: A=T and G=C
17). A. Enzymes
18). E. 5
Explanation: Each successive three nucleotides is considered as one codon.
19). E. Introns
Explanation: Introns are non-protein coding regions present in the pre-mRNA. They are removed in nucleus before leave the nucleus.
20). A. 1
Explanation: Each mRNA molecule is single stranded.
21). C. Exon
Explanation: Exons are the only protein coding regions of the gene.
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