Which of the following factors would increase the rate of chemical reactions?
presence of enzymes
decreased concentration of reactants
lower activation energy
A&B
A&C
The Correct Answer is E
A. presence of enzymes: Enzymes are biological catalysts that speed up reactions by lowering activation energy.
B. decreased concentration of reactants: Lower concentration means fewer collisions between molecules, which slows reaction rate.
C. lower activation energy: Lowering the activation energy makes it easier for reactants to form products, increasing reaction rate.
D. A & B: While A is correct, B is not.
E. A & C: Both enzymes and reduced activation energy increase reaction speed.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. contain marker molecules to recognize self cells: Glycoproteins serve as cell identity markers to help the immune system distinguish “self” from “non-self.”
B. to act as the skeleton of the cell: The cytoskeleton, not membrane proteins, acts as the structural support inside the cell.
C. serve as ion channels: Membrane proteins act as channels to allow specific ions to pass through the membrane.
D. act as carrier proteins: Carrier proteins help transport substances across the membrane, often against a concentration gradient.
Correct Answer is C
Explanation
A. anaphase – sister chromatids are pulled to separate ends of the cell: During anaphase, sister chromatids separate and move to opposite poles.
B. metaphase – chromosomes line up at the center of the cell: In metaphase, chromosomes align at the metaphase plate.
C. telophase – nuclear envelope is breaking down; chromosomes are condensing: In telophase, the nuclear envelope is reforming, and chromosomes are de-condensing into chromatin. The description given fits prophase, not telophase.
D. interphase – cell is going about its daily business, at the end DNA is duplicated and starts condensing: During interphase, the cell grows and replicates DNA in preparation for mitosis.
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