Explain why enzymes are often called organic catalysts
What will be an ideal response?
Enzymes are special protein catalysts. Proteins are one class of organic compounds.
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Extending from the conus medullaris are hairlike nerve fibers that remain within the vertebral canal that are called the filum terminale.
Answer the following statement true (T) or false (F)
What is the correct sequence of events along an axon that follows a membrane
reaching threshold potential? 1. The membrane depolarizes. 2. Sodium channels open and sodium ions diffuse inward. 3. The membrane repolarizes. 4. Potassium channels open and potassium ions diffuse outward. A) 1, 2, 4, 3 B) 4, 1, 3, 2 C) 3, 2, 4, 1 D) 2, 1, 4, 3
The characteristic reddish brown color of skeletal muscle comes from which substance?
A) Actin B) Myoglobin C) Myosin D) Calcium
After fertilization, the first cell division is completed
A) within a few seconds. B) within the hour. C) about 6 hours later. D) in 12 hours. E) more than a day later.