Why does ice float in liquid water?
A) The high surface tension of liquid water keeps the ice on top.
B) The ionic bonds between the molecules in ice prevent the ice from sinking.
C) Ice always has air bubbles that keep it afloat.
D) Stable hydrogen bonds keep water molecules of ice farther apart than water molecules of liquid water.
E) The crystalline lattice of ice causes it to be denser than liquid water.
Answer: D
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The pairing of homologous chromosomes is called
A. syngamy. B. synapsis. C. alignment. D. independent assortment. E. crossing over.
Which of the following best describes the relationship of insulin to glucagon?
A) They work together to prepare the body to deal with stress. B) Insulin stimulates the pancreas to secrete glucagon. C) High levels of insulin inhibit pancreatic secretion of glucagon. D) They are antagonistic hormones.
Which of the following is an iron-binding protein produced by pathogens to access the body's store of iron?
A) gastroferritin B) hemolysin C) ferritin D) transferrin E) siderophores
The basic categories of hormones are peptide or proteins, steroids, and aminoacid derivatives. The chemical properties of each hormone type determine someof its functional properties and how it must interact with receptors to signal to the cell.Is it likely that a small, hydrophilic hormone can cross the cell membrane?
A. Yes B. No