Nucleic Acids - Mastering HW 7

if one strand of a DNA molecule has the sequence of bases 5'ATTGCA3' the other complementary strand would have the sequence

5'TGCAAT3'

if 14C-labeled uracil is added to the growth medium of cells, what macromolecules will be labeled?

RNA

Which of the pairs of base sequences could form a short stretch of a normal double helix of DNA?

5'-ATGC-3' with 5'-GCAT-3'

if a DNA double helix is 100 nucleotide pairs long and contains 25 adenine bases, how many guanine bases does it contain

75

5 end of a polynucleotide strand of RNA

has a phosphate group attached to the number 5 carbon of ribose

a nucleotide is compose of

- phosphate group - nitrogen-containing base - 5-C sugar

If a strand of DNA has the nitrogen base sequence 5'-ATTGC-3', what will be the sequence of the matching strand?

3'-TAAACG-5'

If one strand of a DNA molecule has the sequence of bases 5'-ATTGCA-3', the mRNA synthesized following the template will be

3-UAACGU-5

the central rule of molecular biology states that

DNA is transcribed into RNA, which is translated into protein

the differences between DNA and RNA

DNA nucleotides contain a different sugar than RNA nucleotides

the flow of genetic info in a cell goes from

DNA to RNA (transcribed) RNA to protein (translated)the

When nucleotides polymerize to form a nucleic acid ________

a covalent bond forms between the sugar of one nucleotide and the phosphate of a second

nucleotides

a nitrogenous base, a phosphate group, and a sugar

3 possible components of a DNA nucleotide

deoxyribose, phosphate group, thymine

one of the primary functions of RNA molecules is to

function in the synthesis of proteins

the two strands of a DNA double helix are held together by ______ that form between pairs of nitrogenous bases

hydrogen bonds

the relation between amino acids and polypeptide is similar to the relation between

nucleotide and nucleic acid

the building blocks or monomers of nucleic acid molecules are called

nucleotides

Which feature of large biological molecules explains their great diversity?

the many ways that monomers of each class of biological molecules can be combined into polymers

In an RNA sample,

the number of purine may or may not be equal to the number of and pyrimidine

enzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join nucleotides together. What would happen to DNA molecules treated with these enzymes?

the phosphodiester linkages of the polynucleotide backbone would be broken

what is the major difference between RNA and DNA?

type of sugar