Some restriction enzymes cut at specific and unambiguous sequences (e.g., NotI at GCGGCCGC). As such, the distance between two such sites in a large random DNA sequence is 48, assuming a 50% G+C DNA content
However, the sequence recognized by XhoII is said to be ambiguous (Pu-GATC-Py, where Pu = any purine and Py any pyrimidine). What, therefore, is the expected distance between two XhoII sites in a large random sequence? A) 4 × 4 × 4 × 4
B) 1 × 4 × 4 × 4 × 4 × 1
C) 2 × 4 × 4 × 4 × 4 × 2
D) 46
E) 42 × 22
C
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During exercise, which organs receive an increase in the proportion of cardiac output delivered to them?
A) gastrointestinal tract and skeletal muscle B) skeletal muscle, heart, and brain C) skeletal muscle, heart, and skin D) brain and heart E) skeletal muscle, skin, and brain
A functional open reading frame (ORF) is defined by the presence of following elements EXCEPT
A) promoter sequence upstream of the ribosome binding site. B) start codon. C) stop codon. D) operator sequence that is regulated by a repressor protein. E) ribosome binding site upstream of the start codon.
The figure below shows five water molecules. The hydrogen bonds shown in this figure are each between
A) two hydrogen atoms.
B) an oxygen and a hydrogen atom of the same water molecule.
C) an oxygen and a hydrogen atom of different water molecules.
D) two atoms with the same charge.
Hemolytic uremic syndrome is caused by
A) Escherichia coli O157:H7. B) Serratia marcescens. C) Proteus mirabilis. D) Bacteroides fragilis. E) Salmonella typhi.