Exam 12: How Genes Work

The bases of RNA are the same as those of DNA with the exception that RNA contains:

The three types of RNA involved in protein synthesis are mRNA,_______________,and ________________.

For a gene to be transcribed,the RNA polymerase has to bind to a(n)_____ sequence of nucleotides on the DNA.

A type of DNA sequence that expands access to a gene to promote its expression is a(n)_______________.

The process of bringing in the appropriate amino acid into position along the mRNA in the cytoplasm is:

The site where RNA polymerase attaches to the DNA molecule to start the formation of mRNA is called a(n):

Which of the following is correct about the genetic code?

The genetic code is a ____________ code.

How many different codons are possible with the four different nucleotides?

The RNA copy of DNA that leaves the nucleus and travels to the cytoplasm to make proteins is:

The nucleotide sequences on DNA that actually have information encoding a sequence of amino acids are:

Which site on the ribosome does the new tRNA bring an amino acid to?

Small interfering RNAs can alter gene expression by targeting mRNA for destruction or by blocking translation of a mRNA.

Describe the differences between DNA and RNA.

The genetic code is universal,the same in practically all organisms.

Due to _________,the 25,000 genes of the human genome seem to encode as many as 120,000 different expressed mRNAs.

In humans,what percent of the genome is devoted to the exons that encode proteins?

Which of the following cannot be a product of transcription?

When mRNA leaves the cell's nucleus,it next becomes associated with:

The use of DNA information to direct the production of particular proteins is called: