Concordance values for twins are only useful in studying traits that are completely heritable. Indicate whether the statement is true or false
F
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In most fungi, karyogamy does not immediately follow plasmogamy, which consequently _____
A) means that sexual reproduction can occur in specialized structures B) results in multiple diploid nuclei per cell C) allows fungi to reproduce asexually most of the time D) results in heterokaryotic or dikaryotic cells E) is strong support for the claim that fungi are not truly eukaryotic
Cloning a gene involves all of the following except
A. introducing ligated DNA into E. coli cells. B. insertion of the gene into an appropriate vector. C. expression of the vector and the gene in a cell-free environment. D. isolating the fragment of DNA containing the desired gene.
A urease test is used to identify Mycobacterium tuberculosis because
A) urease is a sign of tuberculosis. B) M. tuberculosis produces urease. C) urea accumulates during tuberculosis. D) some bacteria reduce nitrate ion. E) M. bovis can cause tuberculosis.
Before another action potential “spike” can occur
a. there must be a very brief restoration of the resting conditions in the membrane.
b. the membrane voltage must drop to zero.
c. the sodium-potassium pump must cease temporarily.
d. all of the membrane gates must be closed at the same time.
e. all of these must happen.