If someone were to mention 'lock and key' in reference to enzymes, you would know that she means that The substrate unlocks the energy potential of the enzyme The enzyme will only work with a specific substrate The enzyme opens the substrate to receive energy to begin the reaction
What will be an ideal response?
The enzyme will only work with a specific substrate
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Answer the following statements true (T) or false (F)
1. Chronic release of excess thyroxine can cause a sustained increase in heart rate and a weakened heart. 2. Arterial blood supply to heart muscle is continuous whether the heart is in systole or diastole. 3. Trabeculae carneae are found in the ventricles and never the atria. 4. The "lub" sounds of the heart are valuable in diagnosis because they provide information about the function of the heart's pulmonary and aortic valves. 5. Autonomic regulation of heart rate is via two reflex centers found in the pons.
Which of the following statements about cancer cells is/are incorrect?
a. They arise only when multiple independent mutations occur within the same cell. b. They lack the ability to perform the specialized functions of the normal cell-type from which they mutated. c. The body has no means by which to defend against them. d. They usually do not adhere well to neighboring cells, so some of them may break away from the parent tumor. e. Both a and d are incorrect
Cholesterol is a common precursor for polypeptide hormones
Indicate whether the statement is true or false
What condition is caused by uneven curvatures in the lens?
a. astigmatism. b. myopia. c. presbyopia. d. hyperopia. e. none of these answers.