Imagine you are entering a darkened cavern. You are excited, but also a little nervous. Your heart rate quickens, your blood pressure rises slightly, and your digestive system activity decreases as blood is diverted to your muscles—all changes that prepare you should you need to move rapidly. This type of change is an example of:
A. positive feedback control.
B. negative feedback control.
C. a failure of homeostasis.
D. feedforward regulation.
E. open loop feedback.
D. feedforward regulation.
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Which of the following statements regarding sexual and asexual reproduction is true?
A) Cell division only occurs after sexual reproduction. B) Only offspring from asexual reproduction inherit traits from two parents. C) Sexual reproduction typically includes the development of unfertilized eggs. D) Sexual reproduction is more likely to increase genetic variation than is asexual reproduction.
The enzyme packet on the head of a sperm that allows penetration into the egg is called the
a) centriole b) centromere c) acrosome d) prothallus e) penile penetrating enzyme
Why is the cassava plant difficult to engineer without the help of modern biotechnology?
A) The plant has a very low mutation rate. B) The plant is long lived making selective breeding ineffective. C) The plant is integral to African agriculture and is already optimized. D) The plant does not undergo recombination events, which limits genetic drift.
In the case of infants and small children, how much blood is usually drawn for bacterial culture?
a. 0.5 mL b. 1 mL c. 1 to 5 mL d. No more than 10 mL