21) A base pair a unit of DNA that consists : 1380809.
21) A base pair is a unit of DNA that consists of:
A) one sugar bonded to one phosphate.
B) a single chromosome.
C) one nucleotide.
D) two nucleotides, one on each complementary strand of a DNA molecule.
E) two identical chromosomes.
22) What happens to the two original strands of a DNA molecule after the DNA has replicated?
A) After serving as replication templates, the two original strands are rejoined.
B) After serving as replication templates, the two original strands are destroyed.
C) Nucleotides from the original strands are randomly incorporated into the new strands.
D) Incomplete segments of the original strands end up in each newly synthesized strand.
E) Each original strand ends up paired with a newly synthesized strand.
23) The two strands of a double helix of DNA are linked by what kind of bond?
A) sugar-phosphate linkages
B) hydrogen bonds between bases
C) hydrogen bonds between sugars and phosphates
D) sugar-base linkages
E) base-phosphate linkages
24) If the sequence TCGTA was used as a template in DNA replication, what would be the sequence of bases on the newly synthesized strand?
25) What is the complementary sequence for a segment of DNA with the sequence ACGGCT?
26) In DNA, A, C, G, and T are abbreviations for the:
A) different types of bases on the nucleotides.
B) different types of sugars on the nucleotides.
C) types of genes found on DNA chromosomes.
D) different types of bonds that form between nucleotides.
E) different types of phosphates on the nucleotides.
27) The three components of a DNA nucleotide are:
A) amino acids, phosphates, and deoxyribose.
B) bases, deoxyribose, and polymerases.
C) genes, sugars, and bases.
D) phosphates, sugars, and bases.
E) polymerases, ligases, and sugars.
28) A key part of DNA’s function is to encode information. In considering how information-rich a particular molecule might be, a question is how many different sequences are possible in a particular length of the molecule. In the case of DNA the four different nucleotides can be arranged in any order. How many different sequences are possible for a DNA strand three nucleotides long?
29) A DNA molecule can be described as a twisted ladder. The ________ form the sides, and the ________ form the rungs.
A) base pairs; sugar-phosphate chains
B) sugars; phosphates
C) sugars; base pairs
D) sugar-phosphate chains; base pairs
30) There are two alleles for each gene in a cell. If each gene encodes for a particular protein, what would make two alleles different from each other?
A) The sequence of bases in the DNA for each allele would be slightly different and would lead to the production of slightly different proteins.
B) The sequence of bases in the DNA would be different for each allele, but they would result in the production of identical proteins.
C) The sequence of bases in the DNA would be identical for each allele, but they would produce very different proteins.
D) The sequence of bases in the DNA would be identical for each allele, but one would produce a protein and the other would not.