New PDF release: ANIMAL CELLS AND TISSUES

By Farabee M.

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The axon is typically a long, slender extension of the cell body that sends stimuli. ■ Neuroglia, or glial cells, provide support functions for the neurons, such as insulation or anchoring neurons to blood vessels. Figure 3-5 A neuron is a basic structural unit of the nervous system containing a cell body, dendrites, and an axon. F 52 5/1/01 8:49 AM Page 52 CliffsQuickReview Anatomy and Physiology Muscle Tissue There are three kinds of muscle tissues (see Figure 3-6): ■ Skeletal muscle consists of long cylindrical cells that, under a micro- scope, appear striated with bands perpendicular to the length of the cell.

Also during the S phase the second DNA molecule for each chromosome is synthesized. As a result of this DNA replication, each chromosome gains a second chromatid. During the G2 period of growth, materials for the next mitotic division are prepared. The time span from one cell division through G1, S, and G2 is called a cell cycle (Figure 2-5). A cell that begins mitosis in the diploid state—that is, with two copies of every chromosome—will end mitosis with two copies of every chromosome. However, each of these chromosomes will consist of only one chromatid, or one DNA molecule.

Two difficulties must be resolved during replication. First, DNA polymerase, the enzyme that regulates the attachment of new nucleotides to the growing complement strand of DNA, can perform this task in only one direction. The two strands that make up the double helix, however, are oriented in opposite directions (anti-parallel). On one strand, the DNA polymerase can operate continuously toward the replication fork as the DNA double helix is unzipped. The new DNA strand generated in this manner is called the leading complementary strand.

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ANIMAL CELLS AND TISSUES by Farabee M.


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