Which of the following is the strongest piece of evidence for why some scientists believe that we are at the start of a sixth mass extinction?
A) decrease in biodiversity
B) decrease in fossil discoveries
C) decrease in allopatric species
D) decrease in hybrid fertility
A
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Which of the following prokaryotic nutritional
groups use CO2 and inorganic substances to produce energy? a. photoautotrophs b. chemoautotrophs c. photoheterotrophs d. chemoheterotrophs e. none of these
Insulin lowers glucose concentration in the blood, by binding to receptors on liver cells, adipose tissue, and skeletal muscle cells. What type of receptor does insulin bind to?
1.adrenergic receptor 2.G-protein–coupled receptor 3.internal receptor 4.receptor tyrosine kinase
ATP is formed when ____ the thylakoid lumen
a. hydrogen ions enter b. hydrogen ions leave c. electrons enter d. electrons leave e. water is split in
The coronary arteries supply blood to cardiac tissue. Which chamber of the heart requires the greatest amount of blood supply to keep it working?
A) left atrium B) right atrium C) left ventricle D) right ventricle