The calcium that triggers muscle contraction is stored in the
A) motor neuron.
B) plasma membrane of cells.
C) endoplasmic reticulum.
D) mitochondria.
Answer: C
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Which was likely the first of the following metabolic pathways or structures to evolve?
A. fermentation B. the citric acid cycle C. electron transport complexes I, II, and III D. ATP synthase E. All four probably arose at the same time in an early prokaryote.
In animals that display indeterminate development
A. embryonic cells have a predetermined fate. B. bilateral symmetry cannot develop. C. early embryonic cells, if separated from the embryo, can develop into complete organisms. D. embryonic cells show spiral cleavage. E. the blastopore develops into the mouth.
What is the goal of DNA sequencing?
a. to determine the protein products of particular genes b. to distinguish the exons from the introns c. to determine the precise order of the nucleotides d. to distinguish wild type from mutated DNA
Which of the following is not a function of a plant's root system?
A. energy production B. anchoring the plant C. nutrient absorption. D. water absorption E. a site for beneficial relationships with fungi