Explain the relationship between microtubules, cilia, flagella, centrioles, spindle fibers, and the centrosome.
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Microtubules are a cytoskeletal protein made of tubulin. Microtubules form a major component of the internal scaffolding of the cell. Microtubules can also be assembled into cilia and flagella, which are organelles that produce cell-generated movements, and into centrioles and spindle fibers. Centrioles produce the spindle fibers, which are responsible for changing the position of chromosomes during nuclear division. Centrioles are part of a larger structure known as the centrosome, which also includes a darkly staining material and acts as the cell's microtubule organizing center.
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Which of the following amino acids is specified by the most corresponding codons?
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The hepatic portal vein ________.
A) is actually an artery B) carries nutrient-rich blood to the liver C) carries oxygen-rich blood from the liver to the viscera D) carries blood from the liver to the inferior vena cava
The root of a tooth is covered by
A) enamel. B) cement. C) dentin. D) pulp. E) the root canal.
Answer the following statements true (T) or false (F)
1. Many hormones synthesized in the gastrointestinal tract are chemically identical to brain neurotransmitters 2. All of the following hormones are secreted by the adenohypophysis: ACTH, FSH, and LH. 3. Iodine is an essential element required for the synthesis of thyroxine. 4. The endocrine gland that is probably malfunctioning if a person has a high metabolic rate is the parathyroid. 5. Growth hormone always exerts its influence by targeting other endocrine glands to produce hormones.