_______ are complex carbon ring structures that
often have an iron atom at their center.
a. Hemes
b. Globins
c. Globulins
d. Sugars
e. Alkenes
Answer: a
You might also like to view...
Honeybees must maintain specific temperatures to thrive. On hot days, the hive can quickly
overheat, so some bees will stand near the entrance and fan their wings to provide cool air currents into the hive. In winter, honeybees cluster together in their hives and vibrate their wings in a form of shivering to generate heat and maintain the hive at a constant temperature. This heating and cooling is a form of
a. homeostasis. b. evolution. c. competition. d. homology
Food preference in garter snakes is a learned behavior
a. True b. False
What serves as the cardiac pacemaker?
a. sinoatrial node b. atrioventricular node c. gap junction d. the left ventricle e. conducting fiber
Following intense exercise, the human body attempts to overcome oxygen debt by
A) sweating. B) elevating heart rate. C) producing ATP. D) taking deep breaths. E) inhibiting contractions of smooth muscle.