Exam 15: Genes and How They Work

Analysis of a bacterial gene indicates that 24% of the nucleotides in the coding strand contain the base A,18% contain the base T,26% contain the base G,and 32% contain the base C.What percent of the nucleotides in the mRNA transcribed from this gene will contain the base U? (Enter your answer as a number only without the percent sign,e.g.enter 5 not 5%.)

During translation in prokaryotes,formation of the initiation complex requires all of the following except

You are excited because your lab is studying the first microorganisms retrieved from Mars! Interestingly,their genetic material consists of a single-stranded nucleic acid with six different nitrogenous bases.Like organisms from Earth,segments of the nucleic acid contain the code for making proteins.If the genetic code in these organisms was read in groups of 2 bases instead of 3,what is the maximum number of amino acids that could be coded for assuming that only one codon functioned as a stop codon? (Enter your answer as a numeral not a word,e.g.enter 17 not seventeen.)

When a polypeptide is being assembled,the bond that forms between a newly added amino acid and the previous amino acid in the chain is a ________ bond.

During ________,RNA polymerase synthesizes a molecule of RNA using DNA as a template.

During translation,amino acids are carried to the ribosome by

The mutation responsible for Huntington's disease is a

Gene expression involves two phases,________ and translation.

The sequence of nucleotides in a DNA molecule is called the ________ code.

Which molecule combines with proteins to form both the large and small ribosomal subunits?

Codons that serve as "stop" signals for translation are recognized by

Eukaryotic and prokaryotic organisms differ in how they process genetic information.Which statements best explain one of these differences?

In prokaryotes,the form of RNA polymerase that can accurately initiate synthesis of RNA is called

To remove noncoding sequences in the pre-mRNA of eukaryotes,multiple snRNPs combine with proteins to form a larger complex called the ________.

In eukaryotes,translation takes place

The "one-gene/one-enzyme" hypothesis was proposed by

You are studying an individual with very low levels of insulin in her blood.Further analysis indicates that cells of her pancreas are producing normal levels of this protein,but it is accumulating in the cytoplasm rather than being secreted from the cells.Which hypothesis makes the most sense to explain this observation?

Which base in an anticodon will pair with the base adenine in a codon?

Ribosomes are complex aggregates of