Some restriction enzyme recognition sites are not necessarily rotationally symmetrical. For example, the enzyme Btg I cleaves DNA at the site 5' C^CRYGG, where the symbol ^ represents the cleavage site, R= either purine, and Y = either pyrimidine. Make the simplifying assumptions that equal amounts of each of the four bases exist in the human genome and that the base sequence is random. How frequently would you expect to find Btg I sites in the human genome? How many of these sites would you expect to have rotational symmetry? a. Once in 1024 base pairs; none of them.
b. Once in 4096 base pairs; none of them.
c. Once in 4096 base pairs; half of them.
d. Once in 1024 base pairs; one fourth of them
e. Once in 1024 base pairs: half of them
f. Once in 4096 base pairs; one fourth of them.

According to piaget, children have acquired the cognitive skill of conservation when they're able to a. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal. b. understand the viewpoint of other people. c. relate objects around them to their own needs. d. realize that the term heavy describes an object one way and the term big describes it another way. it is not b nor c. did this 2 x wrong..

Ms. w, a 21-year-old woman, came into a clinic after suffering a deep laceration on her foot while walking barefoot around her yard. the wound was cleaned, sutured, and bandaged, and she was released to return home after receiving tetanus antitoxoid. within 72 hours, the wound area was red and swollen, the suture line was dark in color, and it was accompanied by severe throbbing pain. ms. w had a high fever, her heart felt like it was racing, and she was finding it hard to concentraten even on simple tasks. she returned to the clinic and was immediately taken to the hospital. following lab tests, a diagnosis of acute necrotizing fasciitis was made. discussion questions 1. explain why ms. w. received a tetanus antitoxoid before leaving the hospital. (see chapters 3 and 4, infection and passive immunity.) 2. explain how acute necrotizing fasciitis developed in this case and the pathophysiology involved. (see acute necrotizing fasciitis.) 3. what is the potential outcome for ms. w if antibiotic drugs do not reduce the infection quickly?

Select the correct answer. what does the hardy-weinberg principle relate to? a. chances of survival of an organism b. frequency of alleles in a population c. natural selection in a species d. causes of evolution among organisms