Independent assortment of chromosomes is a result of _____
A) the random way each pair of homologous chromosomes lines up at the metaphase plate during meiosis I
B) the random combinations of eggs and sperm during fertilization
C) the random distribution of the sister chromatids to the two daughter cells during anaphase II
D) the diverse combination of alleles that may be found within any given chromosome
A
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Why is a false positive more significant in HIV testing of patients than in screening donated blood for transfusions?
A. It isn't-both are equally dangerous/significant. False-positives in PEOPLE can lead to psychological trauma, but false-positives in BLOOD could lead to the useful blood being disposed. B. A false-positive in a PERSON is easily retestable. This makes it more significant, because we would simply quickly retest the person to verify their actual HIV status. C. A false-positive in BLOOD is easily retestable. This makes it less significant, because we would simply quickly retest the blood to verify its actual HIV status. D. This statement is backwards-false-positives in blood testing are more significant. If the false-positive rate is high and we don't realize it, we're more likely to dispose useful blood. This could lead to acute shortages of blood for patients who need transfusions.
Which variable will cause a population to not be stable?
a. Very large population b. Lack of mutations c. Not all individuals survive d. Isolation of the population e. Random mating
Which of the following is a function of the secondary lymphatic system organs?
a) transport of lymph b) clonal selection of B cells c) located where lymphocytes encounter antigens d) all of the choices are correct
A chemical that affects neuronal function but is not stored in presynaptic vesicles is _____
A) acetylcholine B) epinephrine C) nitric oxide D) gamma-aminobutyric acid (GABA)