One of two of a ribosome's binding sites for tRNA during translation; The A site holds the tRNA that carries the next amino acid in the polypeptide chain (A stands for aminoacyl tRNA)
What will be an ideal response?
A Site
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A human fetus that has the genotype XO will be designated female because:
A. female sex is determined by the presence of a gene on the X chromosome. B. female sex is determined by the absence of TDF, a protein produced by a gene on the fetus's Y chromosome. C. female sex is determined by only one X chromosome. D. female sex is determined by the presence of TDF, a protein produced by a gene on the fetus's X chromosome.
The tiny chambers in osteons that contain osteocytes are called _____.
Fill in the blank(s) with the appropriate word(s)
On your way to class, you decide to cross a busy street but fail to notice a fast-moving car coming toward you
When you do see the car, your heart rate and breathing increase, and you feel a burst of energy that helps you quickly move to the sidewalk. Describe how your nervous system was able to process the sight of the car with the need to move your legs.
Which fact best supports the hypothesis of one common ancestor for all life?
A) DNA sequences from bacteria can be transferred to plants and other organisms. B) Species in some groups have homologous anatomical structures. C) Embryonic development is similar for all chordates. D) Species in similar geographic locations show structural similarities.