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 and DHT.
E. Müllerian duct inhibitors.
D
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The chemical composition of the gases surrounding the Earth has changed substantially over the past 4 billion years. One notable change was due to the emergence of photosynthetic organisms. The process of photosynthesis increased the amount of what gas in the atmosphere?
A. Carbon dioxide (CO2). B. Nitrogen (N2). C. Hydrogen sulfide (H2SO4). D. Oxygen (O2). E. Water vapor (H2O).
Which of the following is NOT part of the definition of a hormone discussed in class?
A. released into duct B. acts through a receptor C. regulates activities of cells D. secreted by a gland
Which process of the water cycle releases heat into the atmosphere?
A) condensation B) runoff C) evaporation D) ground-water discharge
Cells in the thyroid gland produce and secrete thyroid hormone (a polymer of amino acids) that helps to regulate metabolism. What organelle is most likely abundant in cells of the thyroid gland?
A) mitochondria B) rough endoplasmic reticulum C) free ribosomes D) lysosomes