The term "codon" refers to
A. a three-nucleotide sequence of DNA that codes for a protein.
B. an amino acid that is coded for by three bases of DNA.
C. a three-base sequence of mRNA.
D. the part of a rRNA molecule where a new amino acid is added.
E. the part of tRNA that is a triplet of bases that forms hydrogen bonds with complementary sequences.
C
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Which statement is consistent with the current understanding of neural tissue?
A. A person is born with all of the neurons they will ever have. B. Most neurons formed in fetal development last a lifetime, but some brain regions in adults can generate new neurons. C. Neurons are constantly dying and being replaced throughout all regions of the brain. D. Stem cells in the brain become glia, which can later become neurons if there is a need for them to do so.
Exposing skeletal muscle fibers to which substance disrupts the cells' troponin-tropomyosin complexes and prevents them from blocking the myosin binding sites on actin?
A) Glycerin B) Calcium C) Acetylcholine D) Sodium
When considering leverage, the part of the bone from the muscle attachment to the joint would be the
A. fulcrum. B. effort arm. C. resistance arm.
Within intestinal epithelial cells, lipids are wrapped in a protein coat to form __________, which will be packaged into secretory vesicles at the Golgi apparatus
Fill in the blank with correct word.