Answer the following statements true (T) or false (F)
1. Frogs have two atria, but only a single ventricle.
2. During their diastole, the heart chambers are contracting.
3. The epithelium lining the circulatory system is termed endothelium.
4. The walls of veins tend to be thicker and more elastic than those of comparably sized arteries.
1. TRUE
2. FALSE
3. TRUE
4. FALSE
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According to the fluid mosaic model of cell membranes, the fluid part of the model refers to ____
a. the constant movement of the hydrophilic tails in the interior of the membrane b. a thin layer of water found sandwiched between the two layers of phospholipids c. the phospholipid molecules which vibrate, spin, and exchange places within the same layer of the bilayer d. the free movement of cholesterol molecules within the membrane e. the frequent flip-flop of phospholipids from one side of the membrane to the other
Which of the following has NOT contributed to the adaptive success of angiosperms over
gymnosperms?
a. vessel elements b. more efficient sugar transport c. ovary d. fruit e. tracheids
Which of the following describes how an acid disrupts the chemical bonds of molecules in a cell?
a. The H+ ions can disrupt hydrogen bonds as the slightly negative portion of the molecule is more attracted to H+ ions than to the hydrogen that was part of the bond. b. The H+ ions can disrupt hydrogen bonds as the slightly positive portion of the molecule is more attracted to H+ ions than to the hydrogen that was part of the bond. c. The OH- ions can disrupt hydrogen bonds as the slightly positive portion of the molecule is more attracted to H+ ions than to the hydrogen that was part of the bond. d. The OH- ions can disrupt hydrogen bonds as the slightly negative portion of the molecule is more attracted to H+ ions than to the hydrogen that was part of the bond. e. The H+ ions disrupt the covalent bonds that hold the molecule together.
Hypertrophic cardiomyopathy is characterized by:
A) enlargement or thickening of the heart muscle. B) progressive shrinking of the right side of the heart. C) a significant reduction of blood return to the atria. D) generalized thinning of the left and right ventricles.