A structure essential to the reproduction of gymnosperms is the
A. flower.
B. spore.
C. cone.
D. angiosperm.
Ans: C. cone.
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One of your best friends loves to run long distances. You ask her what she enjoys about running. In addition to good physical fitness, she tells you that after a run she feels extra happy
You suspect that her joy might be related to increased production of ________ by the anterior pituitary gland. A) endorphins B) releasing hormones C) prolactin D) adrenalin
The hanging drop preparation is useful when observing biochemical reactions
a. true b. false
Sodium-potassium pumps increase the charge gradient across the neuron membrane by moving ________
a. one potassium ion into the cell and one sodium ion out b. two potassium ions into the cell and three sodium ions out c. three potassium ions into the cell and two sodium ions out d. two potassium ions and three sodium ions out of the cell
A condition in which the male penis cannot beome erect and remains flaccid is called _____.
A) Sterility B) Spermatogenesis C) Prostate condition D) Erectile dysfunction