A string of 30 to 100 adenine nucleotides
A. is found in the promoter region of all genes.
B. is the sequence of which introns are composed.
C. is found at the 3'-end of all tRNAs.
D. is found in the terminator region of all genes.
E. is added to the 3'-end on mRNA during RNA processing.
E
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Which of the following is true of bacterial translation termination?
A. The ribosome continues to synthesize protein until it reaches the 3' end of the mRNA. B. Termination requires the degradation of the ribosome. C. Termination is signaled by the presence of a stop codon in the mRNA.
Some restriction endonucleases cut the DNA in such a way that short, single stranded regions are
created. We call these regions
a. hydrogen-bonding ends b. sticky ends c. tacky ends d. blunt ends e. jagged ends
Which of the following statements about DNA profiles is false?
1.Individuals vary in the length of certain DNA sequences called short tandem repeats located at many different chromosomal sites. 2.Each locus can have dozens of alleles of short tandem repeats (STRs). 3.In the U.S., DNA profiles utilize a standardized set of 13 STRs. 4.STRs are amplified by PCR before Southern blotting and visualization. 5.Due to environmental influences, STRs differ slightly between identical twins. 6.Even very old samples of DNA can yield sequences that are appropriate for DNA profiling.
In the out-of-Africa hypothesis, there was interbreeding between the ancestors of modern humans on three continents.
Answer the following statement true (T) or false (F)