A cell moves sodium ions against its concentration gradient. This is an example of ____
a. active transport
b. osmosis
c. diffusion
d. facilitated diffusionc
e. diffusion through a channel
ANSWER: a
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The undifferentiated genitalia of an early human embryo develops into male genitalia under the influence of ____
a. oxytocin b. prostaglandin and DHT c. prolactin d. testosterone, AMH, and DHT e. Wolfian duct inhibitors
Although the function of the flexible outer sheath in which the axial filaments of spirochetes lay is unknown, it is essential (i.e., the bacteria will not survive if it is removed).
Answer the following statement true (T) or false (F)
On his voyage, Darwin discovered fossils of the extinct armored glyptodonts and noticed the similarity they shared with modern:
a. rodents. b. finches. c. turtles. d. armadillos. e. ostriches.
Which of the following is not an accessory pigment used to absorb photons that cannot be captured by chlorophyll?
A) ?-carotene B) phycoerythrin C) lutein D) phycochlorophyll E) phycocyanin