Bio Final

Front

If 35% of an organism’s DNA is thymine, what is the percentage of guanine?

Back

15%

Front

Chargaff’s rules of base pairing are explained by which structural feature of DNA?

Back

DNA is double stranded, and hydrogen bonds between base pairs hold the strands together.

Front

What would happen if a cell divides before DNA replication is completed?

Back

Daughter cells would receive incomplete genetic information, but would regain lost information in the S phase.

Front

The sequence of nitrogenous bases on a portion of a strand of DNA is shown in the diagram. From left to right, what is the corresponding sequence of the complementary strand?

Back

CCACTGA

Front

Alvin is studying a model of the chemical structure of a common nucleic acid. He observes that the nucleic acid consists of four nitrogenous bases: adenine (A), cytosine (C), guanine (G), and uracil (U). Alvin's observation most strongly supports which of these conclusions?

Back

The nucleic acid is a form of RNA, and is not DNA.

Front

Which type or types of RNA contain a copy of the instructions that a gene carries?

Back

mRNA only

Front

To identify the amino acid sequence encoded by the mRNA, which would be the most useful first step for Robert to follow? AUGCCACAGGGUUCAUCCGAA…

Back

Separate the list into three-letter "words."

Front

A point mutation changes a codon in an mRNA molecule. Will the mutation affect the polypeptide that forms? Why?

Back

Maybe. Some pairs of codons are translated into the same amino acid.

Front

Frieda claims she can determine which sex chromosome was donated by the male and female parents from a human karyotype. Under which condition is her claim accurate? Options: The karyotype was taken from a newborn baby, The karyotype was taken from a male, The karyotype was taken from a female, The karyotype includes three copies of an autosome.

Back

The karyotype was taken from a male.

Front

A scientist has divided a DNA molecule into several fragments. Next, the scientist would use gel electrophoresis to accomplish which task?

Back

separating the fragments by size