A bat's wing and a sheep's front leg are ________ structures
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homologous
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Why are waterlogged soils often infertile?
A. Nitrifying bacteria require oxygen, and the excess water takes the place of oxygen-containing air. B. Water molecules are used instead of oxygen for cellular respiration. C. There is less carbon in waterlogged soil than dry soil. D. The lack of physical space in this type of soil blocks bacterial growth.
In an experiment similar to that performed by Shatkin and colleagues, a student synthesized mRNAs such that 32P-GTP was incorporated; 7-meG labeled with 3H was used to cap the mRNA
A fraction of the sample was run on a gel and confirmedthat radiolabeled capped transcripts had indeed been produced. The remainder of mRNA was incubated with wheat germ cell extract to allow binding to ribosomes. The sample was deposited at the top of a sucrose density gradient and spun in a centrifuge. Surprisingly, neither label comigrated with the ribosome fraction; the ribosomes did migrate as expected. What is the most likely reason for this result? A. The ribosomes did not incorporate the 3H label. B. The sucrose gradient was not made correctly. C. The wheat germ was contaminated with guanylyltransferase. D. The wheat germ was contaminated with RNase E. The centrifuge did not spin at the correct speed.
Which term describes the long spongy bodies under the labia majora that run from the tip of the clitoris to either side of the vagina?
A. Seminiferous tubules B. Fallopian tubes C. Vasa deferentia D. Crura
The brain interprets the ________ of light on the basis of the number and frequency of action potentials it receives from light receptors in the retina
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