AP Bio Unit 6 Check: DNA, RNA, & Replication

What are plasmids in a bacteria cell used for?

• Plasmids are used for energy production in bacteria.
• Plasmids are used for environmental factors such as antibiotic resistance and metabolic functions in bacteria.

• Plasmids are responsible for cell division in bacteria.
• Plasmids help in the formation of bacterial cell walls.

Choose all of the DNA nucleotide bases that are identified as purines.

• Adenine, Guanine
• Cytosine, Thymine

• Thymine, Uracil

• Uracil, Adenine

Choose all of the DNA nucleotide bases that are identified as pyrimidines.

• Adenine, Guanine
• Cytosine, Thymine

• Thymine, Uracil

• Uracil, Adenine

Which of the answers below describes the difference between chromosomal DNA & a plasmid?

• Chromosomal DNA is found only in bacteria, while plasmids are found in all organisms.
• Chromosomal DNA is essential for life, while plasmids are extra genetic elements that can provide advantages.
• Plasmids are essential for life, while chromosomal DNA is not necessary.
• Chromosomal DNA is smaller than plasmids and carries fewer genes.

Choose from the answers below all of the differences between eukaryotic and prokaryotic DNA.

• Eukaryotic DNA is linear, multiple chromosomes, located in a nucleus; Prokaryotic DNA is circular, single chromosome, located in nucleoid region.

• Prokaryotic DNA is linear, not associated with histones, multiple chromosomes, located in the nucleus.

• Eukaryotic DNA is circular, associated with histones, single chromosome, located in nucleoid region.

• Eukaryotic DNA is circular, not associated with histones, multiple chromosomes, located in the nucleus.

Which answer below correctly identifies the location of the 5' and 3' ends of DNA?

• The 5' end is at the hydroxyl group, and the 3' end is at the phosphate group.
• The 5' end is at the phosphate group, and the 3' end is at the hydroxyl group.
• Both the 5' and 3' ends are located at the sugar molecule.
• The 5' end is in the middle of the DNA strand, and the 3' end is at the base pairs.

If a parental DNA strand reads: 5’- CAATAGCA -3’ what would the complementary strand read?

• 5’- GTTATCGT -3’

• 5’- GUUACGCU -3’

• 3’- CAATAGCA -5’

• 3’- GTTATCGT -5’

Choose the option that best describes nucleotide pairing in DNA.

• Adenine will form one hydrogen bond with uracil. Cytosine will form two hydrogen bonds with guanine.

• Guanine will form two covalent bonds with cytosine. Thymine will form two covalent bonds with adenine.

• Cytosine will form three hydrogen bonds with guanine. Adenine will form two hydrogen bonds with thymine.

• Thymine will form two covalent bonds with adenine. Guanine will form three covalent bonds with cytosine.

The backbone of DNA is comprised of a ​ (a)   and a deoxyribose​ (b)   that are ​ (c)   , while the center is comprised of (d)   that are connected with ​ (e)   .

• sugar
• phosphate group
• nitrogen bases
• covalently bonded
• hydrogen bonds

DNA strands are ____________________________, meaning one strand runs from ________________ while the other strand runs from ________________. (3 pts)

• antiparallel, 5' to 3', 3' to 5'

• parallel, 5' to 3', 5' to 3'

• antiparallel, 3' to 5', 3' to 5'

• parallel, 3' to 5', 5' to 3'