How do evolutionary biologists view the notion of biological "progress"?
A. Evolution proceeds toward a goal (teleology).
B. Lasting evolutionary progress does not occur because of cyclical phenomena, such as iterative mass extinctions.
C. Progress can be measured by levels of hierarchical organization among individuals of the same species.
D. Objective definitions of progress are fraught with difficulty, as the processes that drive evolution have no mechanism for foresight.
E. Progress can be measured by how much a given species resembles Homo sapiens.
Answer: D. Objective definitions of progress are fraught with difficulty, as the processes that drive evolution have no mechanism for foresight.
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The five steps listed below are involved in excitation-contraction coupling
1. A wave of depolarization passes through the T-tubules. 2. Ca2+ binds to and causes a conformational change in troponin. 3. Tropomyosin moves to expose myosin-binding sites on the actin. 4. Ca2+ is released from the sarcoplasmic reticulum. 5. Cross-bridges form and produce a contraction. Which of the following lists the steps in the correct order of events? A. 1, 4, 2, 3, 5 B. 4, 5, 2, 1, 3 C. 1, 2, 4, 3, 5 D. 5, 4, 1, 2, 3 E. 2, 1, 3, 5, 4
If the distance from the front to the back of the eye is longer than normal so that light waves are focused in front of the retina, that person ________
a. will be nearsighted b. will be farsighted c. shows signs of nutritional blindness d. has glaucoma
The structure labeled "G" is the ____
a. aorta b. pulmonary vein c. pulmonary artery d. inferior vena cava e. superior vena cava
The ability of an infant organism to be able to keep track of the location of its mother is an example of:
a. classical conditioning b. habituation c. imprinting d. insight e. operant conditioning