Which of these types of chemical bonds would you not expect to find in biological molecules?
a. covalent bonds
b. van der Waals forces
c. ionic bonds
d. hydrogen bonds
e. all of these types of bonds are found in biological molecules
E
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Aldosterone is a hormone secreted by the adrenal cortex, and insulin is a peptide secreted by the pancreas
When aldosterone contacts a target cell, it binds to an intracellular receptor and migrates to the nucleus; insulin binds to extracellular receptors on the plasma membrane. What is the most likely reason for this difference? A. Aldosterone is hydrophilic and therefore must enter the aqueous environment of the cytoplasm to have an effect. B. Aldosterone is lipid-soluble and therefore easily crosses the phospholipid bilayer of the plasma membrane. C. Aldosterone is too small to bind extracellular receptors on the plasma membrane. D. Insulin is too large to interact with DNA.
The decline of the sea otter population in the Pacific Northwest has been attributed to
A. pollution from an oil spill. B. predation by killer whales. C. a genetic mutation causing a decrease of fertility in male otters. D. an increase in the water temperature. E. predation by Steller sea lions.
What hormone released into the blood (shown by letter D) by the posterior pituitary inhibits or prevents urine formation?
A) thyroid-stimulating hormone (TSH) B) oxytocin C) antidiuretic hormone (ADH) D) cortisol
Which of the following is an accessory organ of the human digestive system?
A. Salivary gland B. Esophagus C. Stomach D. Small intestine E. Large intestine