bio test study 3/4

There are 64 codons and 20 amino acids. Which of the following is true?

• Each codon specifies a different amino acid.

• Some amino acids have no link to a codon.

• Each amino acid is specified by only one codon.

• Several different codons can specify the same amino acid.

what is show in this figure above?

• introns

• anticodons

• exons

• genetic code

Which of the following terms is LEAST closely related to the others?

•   tRNA

•   spindle fiber

•   anticodon

•   polypeptide

What is an exception to the central dogma of molecular biology?

•   Viruses can translate without RNA.

•   Viruses sometimes transfer information from proteins to DNA.

•   Viruses sometimes transfer information from RNA to DNA.

•   Viruses sometimes transfer information from DNA to RNA.

Which of the following is a chromosomal mutation?

•   point mutation

• inversion

• substitution

• insertion

What are some characteristics of polyploidy plants?

•   They tend to be weaker, but bigger than diploid plants.

•   They tend to be smaller, but stronger than diploid plants.

•   They tend to be weaker and smaller than diploid plants.

•   They tend to be bigger and stronger than diploid plants.

A deletion mutation is shown in line B of Figure 13–5.

• true

• false

A translocation mutation is seen in line D of Figure 13–5.

• True

• False

Which of the following statements is true about gene regulation in prokaryotes?

• Expressed genes make more DNA.

• DNA-binding proteins determine whether a gene is expressed.

• Promoters determine whether a gene is expressed.

• RNA polymerase regulates gene expression.

In E. coli, the lac operon controls the

• breakdown of lactose.

• production of glucose.

• breakdown of glucose.

• production of lactose.