What is true about about mammalian red blood cells?
A. Red blood cells are also called leukocytes.
B. A mature red blood cell is shaped like a biconcave disc because it has no nucleus.
C. Red blood cells develop from lymphoid stem cells.
D. Red blood cells contain albumin.
E. Aged red blood cells are removed from the blood by the kidneys.
B. A mature red blood cell is shaped like a biconcave disc because it has no nucleus.
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Because the TCA cycle is associated with degradation and synthesis, the pathway is said to be
A) anabolic. B) amphibolic. C) catabolic. D) bipolar. E) amphipathic.
Which component of the accompanying scenario would be considered the effector?
a. release of insulin b. glycogen and fat synthesis c. potassium ion channel d. increased glucose levels e. liver and muscle
Clumped or patched populations that undergo local periodic extinction and recolonization are called what?
A. randomly spaced populations B. uniformly spaced populations C. metapopulations D. over-sized populations E. endangered populations
In his 1771 experiments, Joseph Priestly determined that plants added something to the air that allow an animal to survive. What do we now know that plants contribute to the air that is essential for animals (and other organisms)?
A. oxygen B. water C. organic sugars D. carbon dioxide