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What is a motor unit? a. all the muscle fibers in a fascicle b. all the myofibrils in a muscle cell c. a motor neuron and all the muscle fibers it innervates d. a spinal nerve and all the muscle fiber
What is the function of the T-tubules? a. they store calcium b. actin and myosin are activated here c. they conduct action potentials from the sarcolemma to the interior of the muscle cell d. they pro
Contraction of skeletal muscle fibers is stimulated by _____. a. autonomic neurons b. sympathetic neurons c. motor neurons d. parasympathetic neurons
What is the protein component of the thin filament that binds to calcium thereby initiating skeletal muscle contraction? a. myosin b. tropomyosin c. troponin d. titan
Question 1: Distinguish between negative and positive feedback control. Question 2: Understand the importance of the difference between lipophobic and lipophilic chemical classifications.
Question 1: What is meant by half-life of a chemical messenger? Question 2: Distinguish between up and down regulation.
Question 1: Name and understand the processes of passive transport and what factors affect rate of diffusion. Question 2: Explain the sodium/potassium pump.Question 3: Explain pinocytosis and phagocyt
What are the main classes of large biological molecules? What are the building blocks for each class of biological molecules? Why are some people lactose intolerant? Mention one benefit and one advers
Ben made a solution containing 68.46 g of sucrose in 0.75 L of water. The molar mass of glucose is 342.30 g/mol. Question: What is the solute in the resulting solution? What is the solvent in the solu
Which of the following organisms is most closely related to a lungfish? Clams, Earthworms, Mosquitoes, Humans Sea stars
A 45-year old woman admitted with severe abdominal pain died within a few hours of pancreatitis. Examination of the mesentery indicated white chalky deposits. These are most likely related to: A. ca
A 77-year old man died of severe congestive heart failure. On autopsy, the mitral valve was found to be the cause of the problem. The changes in the valve were the result of... A. calcifications B.
What is the free energy of lactose breakdown? Assume that G' is -10 kcal/mol for this reaction. Type your calculations in the box below.
A patient is in the hospital with bacterial meningitis. The doctor needs to determine whether the patient has an infection with Neisseria meningitis or Haemophilus influenzae.
Question 1: Why is the buffer's ability to maintain a constant pH limited to the addition of a specific amount of acid or base? Question 2: How do buffers neutralize acids and bases?
Question 1: How does the eukaryotic cell cycle relate to mitotic cell division? Question 2: What is the biological significance of buffers?
A temperate bacteriophage has the gene order x1 x2 x3 att x4 x5. What is the gene order of the prophage?
Human cells normally have 46 chromosomes. For each of the following stages, state the number of nuclear DNA molecules present in a human cell?
The loss of water during a hot day causes the blood volume to decrease and the osmolality of bodily fluids to increase. discuss how antidiuretic hormone can help to maintain homeostasis...
Why is water considered the Solvent of Life? What are water's life-supporting properties?
What is the value of science? What assumptions must be made before science can be employed?
Why is the flow of carbon compounds through the glycolytic pathway greater during growth by fermentation than during growth by respiration? what is the average temperature in san jose?
Which of the following is a way in which the mechanism by which topoisomerase I breaks a DNA strand differs from the mechanism of phosphodiester bond formation? Can be multiple answer. a) Only one i
A mutant protein has been designated as G189A. What does this designation reveal about the mutation?
When glucagon binds to receptors on mammalian liver cells, it activates Protein Kinase A. This kinase will phosphorylate regulatory enzymes and have which of the following impacts on metabolism?