An ecologist is studying the painted turtle population in a small pond. At the beginning of the year, there are 100 individuals. Over the course of a year, 40 turtles are born and 60 die. There is no migration
What is the birth rate per year for this population?
A) 20 B) 60 C) 40 D) 0.4 E) 0.6
D
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Which situation(s) might warrant the removal of a histidine tag when purifying a recombinant protein?
A. Histidine residues inhibit protein folding, thereby decreasing the functionality of the protein. B. The expression vector used for inserting the gene of interest already contains histidine-encoding sequences. C. Histidine residues bind preferentially to nickel resins on the column during purification, and are not washed away. D. All of the choices are correct.
Magnesium has an atomic number of 12. What is the most stable charge for a magnesium ion?
A) a +1 charge B) a +2 charge C) a -1 charge D) a -2 charge
Each of the following is a component of focal adhesions except
A) integrin. B) talin. C) ?-actinin. D) vinculin. E) plakoglobin.
If you were to examine a typical population at a single locus, you would find more copies of the wild-type allele than any other allele.
Answer the following statement true (T) or false (F)