What type of test would you use to determine whether observed data constitute evidence of genetic linkage or are simply a case of chance variation from expected values?
A) test cross
B) two-point test cross
C) three-point test cross
D) chi-square analysis
E) recombination frequency (r) calculation
D
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Which of the following is considered the key innovation that started chordates along the evolutionary path that led to vertebrates?
A. a flexible rod to which muscles are attached, which allowed lateral movement of the back B. an internal endoskeleton C. a skin covering the entire body to prevent desiccation D. a hard shell encasing the body E. amniotic egg
If an organism has the same life strategy as a maple tree, the synaptonemal complex will be observed ____
a. only in alternating generations b. in each generation c. only in a unicellular haploid phase d. only in a multicellular haploid phase e. only in gametophytes
In this diagram of the heart, which of the
following choices correctly identifies A and B?
a. A is the AV node; B is the cardiac pacemaker. b. A is the SA node; B is the septum. c. A is the AV node; B is the SA node. d. A is the SA node; B is the AV node. e. A is the septum; B is the cardiac pacemaker.
Your patient was admitted for a gunshot wound about a week ago. As a precautionary activity, the doctor placed her on antibiotics for a few days while recuperating. Blood specimens are drawn on the patient a several times daily and sent to the microbiology lab for analysis of bacteria. Nothing has grown in culture. On her 4th day in the hospital, she has had no fever and no other signs of infection, but one set of blood specimens has been reported positive for a bacterium. The culture was identified by the lab as Staphylococcus epidermidis, a common organism on the skin. Predict the likely situation leading to this.
A. The patient is immunodepressed and very susceptible to bacterial infection. B. Staphylococcus epidermidis is a skin contaminant that ended up in the blood specimen as a consequence of poor aseptic technique during the venipuncture. C. Staphylococcus epidermidis has converted to a pathogen because of the antibiotics prescribed for the patient. D. Staphylococcus epidermidis is a very slow growing bacterium and was probably in the blood right after the gunshot wound, but failed to grow until now.