Which organelles are filled with powerful enzymes that digest worn-out cell components and destroy microbes?
A) peroxisomes
B) mitochondria
C) lysosomes
D) smooth endoplasmic reticulum
C
Explanation:
A) Peroxisomes are vesicles filled with enzymes that break down fatty acids and other organic molecules.
B) The mitochondria produce energy for the cell.
D) The smooth endoplasmic reticulum synthesizes organic molecules such as cholesterol.
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Heat shock proteins
a. are also known as stress proteins. b. are hydrophobic proteins. c. are attracted to hydrophobic amino acids normally located on the inside of folded proteins. d. are also called molecular chaperones. e. all of these.
The anatomic position allows all observers to have a common point of reference.
Indicate whether this statement is true or false.
Negative-pressure ventilation occurs when:
A) the diaphragm ascends and the intercostal muscles retract. B) air is drawn into the lungs when intrathoracic pressure decreases. C) pressure within the chest decreases and air is forced from the lungs. D) the phrenic nerves stop sending messages to the diaphragm.
Sound waves are converted into mechanical movements by the
A) auditory ossicles. B) cochlea. C) oval window. D) round window. E) tympanic membrane.