The atrioventricular valves are closed when the
A) right atrium is contracting.
B) P wave of an electrocardiogram appears.
C) heart is completely relaxed.
D) ventricles contract.
E) ventricles are relaxed.
D
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A cluster analysis is used when reading a DNA microarray to identify genes whose expression follow a similar patterns
Indicate whether the statement is true or false
In social insects like bees and termites, the nonreproducing members of the hive are always ____
a. maturing into their reproductive phase b. past the age of reproduction c. closely related to the queen d. in competition for space and food e. males
Which technique can be used to detect mutated genes?
a. DNA probes b. biopsy c. x-rays d. MRI e. radioactive monoclonal antibodies
Why don't hormones build up in the body over time?
A. They do, but target tissues become desensitized over time. B. They are deactivated or degraded by target cells after hormone-receptor binding. C. They are filtered out of the blood by lymph tissues. D. Hormone synthesis is subject to positive feedback regulation. E. They are secreted from the body by exocrine glands.