Exam 22: Nucleic Acids and Protein Synthesis

DNA consists of two polynucleotide strands that wind into a left-handed double helix.

Which is a genetic disease?

What is the process by which DNA makes a copy of itself when a cell divides?

What is the name of the nucleoside shown?

The sequence of three nucleotides (a triplet)that codes for a specific amino acid is called a/an _____.

Which base is found in DNA or RNA, but not both?

Which mRNA sequence codes for the amino acid sequence Leu-Gly-Asp-Arg?

A virus is an infectious agent consisting of a DNA molecule and an RNA molecule that is contained within a protein coating.

The restriction enzyme BamHI recognizes the DNA sequence GGATCC and cuts the DNA between the two G's. Given the segment of double-stranded DNA shown below , the sticky ends that result from cleavage with this enzyme are .

Which statement concerning the biomolecules DNA is incorrect?

The primary structure of a polynucleotide is the sequence of nucleotides that it contains, which is determined by the identity of the bases.

There was a mix-up in the hospital nursery and there is a question as to which baby belongs to a set of new parents. The given gel contains the DNA fingerprint of the new mother (Lane 1), the new father (Lane 2), and two infants (Lanes 3 and 4). The DNA fingerprinting indicates that the infant tested in Lane _____ is the child of these parents.

A _____ is a complex of a single DNA molecule and proteins wrapped tightly together in a bundle.

A)by reduced coenzymes that match the codons found on the DNA template strand B)by the transport protein coenzyme A C)by tRNA molecules that contain the complementary sequence of an mRNA codon in their anticodon loop D)amino acids are synthesized at the ribosomes by the hydrolysis of proteins Ans: C Difficulty: Medium -Which structure correctly represents the dinucleotide sequence GU that is found in RNA?

When inserted into a bacterium, recombinant DNA can be used to prepare large quantities of useful proteins.

Which base is at the 3' end of the structure shown?

When the base guanine is added to the 2'-OH of the monosaccharide ribose, the product is guanosine.

In the process of translation, the genetic code contained in DNA is rewritten in mRNA, which leaves the nucleus and carries the information to the ribosomes for protein synthesis.

_____ is an mRNA sequence that codes for the dipeptide Cys-Trp.

The dipeptide produced from the DNA segment CAGCTA is the same as the dipeptide from the DNA segment CAGCTT.