Download e-book for iPad: BRS Cell Biology and Histology (Board Review Series) by Leslie P. Gartner, James L. Hiatt, Judy M. Strum


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

ISBN-10: 1608313212

ISBN-13: 9781608313211

BRS cellphone Biology and Histology is an outline-format evaluate for USMLE and path checks, with considerable electron micrographs and conceptual line drawings, high-yield scientific concerns bins, evaluation questions on the finish of every bankruptcy, and a finished USMLE-format exam on the finish of the ebook. This 6th variation positive aspects 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 scientific concerns were further, and scientific concerns were higher built-in into the content.

A spouse web site will supply the totally searchable textual content and an interactive query bank.

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Additional info for BRS Cell Biology and Histology (Board Review Series)

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10. C. Heterochromatin is the dark-staining nucleoprotein near the periphery of the nucleus. It is transcriptionally inactive but may be responsible for proper chromosome segregation during meiosis (see Chapter 2 V A). qxd 05/31/2010 10:30 AM Page 32 Aptara chapter 3 Cytoplasm and Organelles I. OVERVIEW—THE CYTOPLASM The cytoplasm contains three main structural components: organelles, inclusions, and the cytoskeleton. The fluid component is called the cytosol. The functional interactions among certain organelles result in the uptake and release of material by the cell, protein synthesis, and intracellular digestion.

3. mRNA is synthesized in the following series of steps. a. RNA polymerase II recognizes a promoter on a single strand of the DNA molecule and binds tightly to it. b. The DNA helix unwinds about two turns, separating the DNA strands and exposing the codons that act as the template for synthesis of the complementary RNA molecule. c. RNA polymerase II moves along the DNA strand and promotes base pairing between DNA and complementary RNA nucleotides. d. When RNA polymerase II recognizes a chain terminator (stop codons—UAA, UAG, or UGA) on the DNA molecule, it terminates its association with the DNA and is released to repeat transcription.

3. C. Each tRNA possesses a triplet of nucleotides, called an anticodon, which recognizes the complementary codon in mRNA (see Chapter 2 VIII B). 4. B. The S (synthesis) phase of the cell cycle is the period during which DNA replication and histone synthesis occur, resulting in duplication of the chromosomes. At the end of the S phase, each chromosome consists of two identical chromatids attached to one another at the centromere (see Chapter 2 IX B). 5. D. Klinefelter syndrome occurs only in men.

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BRS Cell Biology and Histology (Board Review Series) by Leslie P. Gartner, James L. Hiatt, Judy M. Strum

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