Arabidopsis plants with a mutation in the gene embryonic Flower (EMF) produce flowers almost immediately after germination, before shoot growth occurs. What is the normal role of this gene?
A. The wildtype EMF allele causes growth of flowers in the embryo.
B. The wildtype EMF allele causes death of the shoot tissue.
C. The wildtype EMF allele prevents flowering from happening too soon.
D. The wildtype EMF allele prevents phase change and facilitates flower determination.
C. The wildtype EMF allele prevents flowering from happening too soon.
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Smaller prokaryotic cells generally grow faster than larger ones due to a higher surface-area-to-volume ratio
Indicate whether the statement is true or false.
Which of the following was observed by Erwin Chargaff?
A. Base composition of DNA does not vary from one species to another. B. The DNA isolated from different tissues of the same species all have the same base composition. C. Base composition changes as the organism ages. D. In all species, the number of adenines equals the number of guanines. E. In all species, A + T = G + C.
A student uses restriction enzymes to cut a DNA molecule into fragments. The digested DNA is loaded into the wells of an agarose gel and the gel is subjected to an electric current. Upon completion of the run, the gel is stained. The type and density of the gel are important because
(A) they influence the rate of migration of the fragments (B) they may cause some DNA molecules to replicate (C) some DNA nucleotides may be lost due to chemical reactions with the gel (D) some DNA molecules may sink to the bottom and not migrate (E) some DNA molecules may cross-link
In most male animals, the penis or other copulatory organ achieves erection by
A. artery dilation or hemolymph pressure. B. bones or exoskeleton interlocking. C. muscle contraction. D. testicular pressure.