How many nucleotides make up a codon?
A) two
B) three
C) four
D) five
B
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Recall that several vascular bundles (containing phloem and xylem) are located around the circumference of a vascular plant stem. In contrast, a root contains one vascular bundle running down its center
What might account for this different arrangement of vascular bundles in stems and roots? A. Stems need to counteract the force of gravity (and support leaves), but roots do not. B. Roots need to quickly transport nutrients to the rest of the plant, but stems do not. C. Roots require less nutrients compared to stems.
Which of the following statements about insect respiration is false?
A. After diffusing through the walls of the tracheoles, oxygen is delivered to the body tissues by the circulatory system. B. Air enters the bodies of insects through abdominal openings called spiracles. C. Air sacs increase the speed of air movement through the respiratory system. D. The insect respiratory system is composed of a series of branching tubes called tracheae. E. None of the answer options is false.
What is considered the most critical function of erythrocytes?
A. the transport of oxygen B. the transport of carbon dioxide C. buffering against changes in blood pH D. assisting in clot formation E. All of the answers are considered the most critical functions of erythrocytes.
During meiosis, each pair of alleles on the homologous chromosomes sorts independently from all other pairs of alleles. This statement corresponds to
A. the law of segregation. B. the law of independent assortment. C. the rule of multiplication. D. the law of probability. E. gene theory.