Provide some of the adaptations that allowed animals to adapt to life on dry land? What will be an ideal response?
On dry land, water conservation is an ever-present concern. Having dry skin and modifying
respirations are good strategies to prevent water loss. But, the key is to be able to filter toxins from the
fluids of the body without losing the fluids themselves. To this end, land animals have evolved very
efficient kidneys to filter metabolic waster and retain water.
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Peptide and protein hormones are polar molecules that ____
a. inhibit the effect of nonpolar hormones b. alter the effect of certain genes c. bind to a receptor at the cell membrane d. move directly across the cell membrane and enter the nucleus e. form ATP
Which of the following substances stimulates contractions in uterine smooth muscle during labor?
A) progesterone B) estrogen C) oxytocin D) prolactin
If you ate a 100% plant-based (vegan) diet, what molecule would you never eat?
A) starch B) cellulose C) cholesterol D) phospholipids
Which class of antibody is found in body secretions such as tears, saliva, and breast milk?
a. IgA b. IgB c. IgM d. IgG e. IgE