BRS Cell Biology & Histology, 6th Edition by Leslie P. Gartner, James L. Hiatt, Judy M. Strum

By Leslie P. Gartner, James L. Hiatt, Judy M. Strum

BRS phone Biology and Histology is an outline-format evaluation for USMLE and path checks, with plentiful electron micrographs and conceptual line drawings, high-yield medical issues bins, overview questions on the finish of every bankruptcy, and a accomplished USMLE-format exam on the finish of the e-book. This 6th variation beneficial properties 60 new full-color photomicrographs and a brand new full-color layout with colorized line drawings. content material and questions were up to date, new medical issues were extra, and scientific issues were larger built-in into the content material. A spouse web site will provide the absolutely searchable textual content and an interactive query financial institution.

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One end of the tRNA molecule possesses an anticodon, a triplet of nucleotides that recognizes the complementary codon in mRNA. If recognition occurs, the anticodon ensures that the tRNA transfers its activated amino acid molecule in the proper sequence to the growing polypeptide chain. 4. Steps by which genetic information encoded in deoxyribonucleic acid (DNA) is transcribed into messenger ribonucleic acid (mRNA) and ultimately converted into proteins in the cytoplasm. : Molecular Biology of the Cell, 2nd ed.

Heterochromatin corresponds to one of two X chromosomes and is therefore present in nearly all somatic cells of female mammals. During interphase, the inactive X chromosome is visible as a dark-staining body within the nucleus. This structure is called the Barr body, or sex chromatin. 2. Euchromatin is the transcriptionally active form of chromatin that appears in the LM as a lightly stained region of the nucleus. It appears in transmission electron microscope (TEM) as electron-lucent regions among heterochromatin and is composed of 30-nm strings of nucleosomes (see section VI) and the DNA double helix.

Heterochromatin. outer nuclear membrane. euchromatin. qxd 05/31/2010 10:18 AM Page 31 Aptara Answers and Explanations 1. D. The nuclear pore complex contains a central aqueous channel that permits passage of small water-soluble molecules. However, movement of proteins in and out of the nucleus is selectively controlled by the nuclear pore complex via receptor-mediated transport (see Chapter 2 II E). 2. C. DNA contains the purines, adenine and guanine, and the pyrimidines, cytosine and thymine. In RNA, uracil, a pyrimidine, replaces thymine (see Chapter 2 VII A, VIII).

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