In a positive-feedback system where hormone A alters the amount of protein X
A) an increase in A always produces an increase in X.
B) an increase in X always produces a decrease in A.
C) a decrease in A always produces an increase in X.
D) a decrease in X always causes a decrease in A.
E) it is impossible to predict how A and X affect each other.
Answer: A) an increase in A always produces an increase in X.
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What is/are characteristic(s) of EPSPs and IPSPs?
a. EPSPs and IPSPs do not influence action potentials. b. EPSPs and IPSPs are graded potentials. c. EPSPs and IPSPs occur via an all-or-none response. d. EPSPs are fast action potentials; IPSPs are slow action potentials. e. EPSPs occur in myelinated axons; IPSPs occur in unmyelinated axons.
All of the following are true about botulinum toxin/Botox except
A) The toxin is one of the most potent toxins known. B) Botox is a SNARE protein. C) It can be used therapeutically to stop muscle spasms. D) It has been used to remove wrinkles caused by muscle contractions. E) It has potential use as a migraine headache treatment.
Energy storage is the primary function of:
A) phospholipids. B) triglycerides. C) waxes. D) cholesterol. E) estrogen
Which statement best supports why animals most likely evolved in the ocean?
a. The ocean water provided buoyanc
b. They did not require a skeleton for support. c. Internal fluid and salt balance was easy to maintain. d. Reproduction was independent of internal fertilization. e. The changeable temperature facilitated natural selection.