Mitochondria
synthesize proteins for use outside the cell
are single-membrane structures involved in the breakdown of ATP
contain their own DNA and RNA codes necessary for their function
contain digestive enzymes called acid hydrolyses
The Correct Answer is C
A. Synthesize proteins for use outside the cell: Proteins for secretion outside the cell are synthesized by ribosomes on the rough endoplasmic reticulum. While mitochondria produce some of their own proteins, they are primarily for internal use in energy metabolism.
B. Are single-membrane structures involved in the breakdown of ATP: Mitochondria are double-membrane organelles, not single-membrane. Their role is to generate ATP through oxidative phosphorylation, not to break it down.
C. Contain their own DNA and RNA codes necessary for their function: Mitochondria possess their own circular DNA and ribosomes, allowing them to produce some proteins and enzymes needed for oxidative phosphorylation.
D. Contain digestive enzymes called acid hydrolases: Acid hydrolases are found in lysosomes, where they break down waste and cellular debris. Mitochondria specialize in energy production, not intracellular digestion.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Increase: An increase in hydrogen ion concentration does not cause the pH to rise; higher hydrogen ion levels correspond to greater acidity, which lowers the pH.
B. Hydrogen ions do not influence pH: Hydrogen ion concentration is the defining factor of pH. Changes in H⁺ directly affect the acidity or alkalinity of a solution.
C. Decrease: pH is inversely related to hydrogen ion concentration. As H⁺ increases, the solution becomes more acidic, causing the pH value to decrease.
D. Stay the same: pH remains constant only if hydrogen ion concentration is unchanged. An increase in H⁺ will alter the pH, so it will not remain the same.
Correct Answer is B
Explanation
A. 2-1-3-4-5: This sequence incorrectly places tissues before cells, but tissues are composed of groups of similar cells, so cells must come first.
B. 2-1-4-3-5: Atoms combine to form molecules, molecules organize into cells, cells form tissues, and tissues assemble into organs. This sequence correctly progresses from the simplest to the most complex level of organization.
C. 1-2-4-3-5: Molecules do not precede atoms; atoms are the fundamental units that combine to form molecules. Starting with molecules makes the sequence inaccurate.
D. 1-2-3-4-5: Placing molecules before atoms and tissues before cells reverses the correct order of structural complexity in the body.
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