1. which of the following occurs prior to speciation?
a) organisms of different populations join together.
b) different species share the same space.
c) a population is divided.
d) a major change on earth takes place.

2. which of the following must be true of their individuals if two populations are no longer the same species?
a) they do not have any of the same genes.
b) they do not share any of the same space.
c) they do not resemble each other at all.
d) they cannot reproduce successfully with each other.

3. how does speciation start to take place on a genetic level between two isolated populations?
a) large numbers of mutations occur.
b) allele frequencies change in different ways.
c) new genes are added to one group.
d) recessive alleles become dominant.

Students commonly confuse saccharomyces cerevisiae and staphylococcus aureus when viewed on a microscope slide how could you microscopically differentiate

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

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?