What aspect of the DNA molecule is responsible for heritable information?
a. the specific placement of the sugars ribose and deoxyribose
b. variations in the patterns of cross-pairings between the bases on opposite sides of the molecule
c. variations in the number of adjacent phosphates within the backbone of the molecule
d. the sequence of bases
d
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Which of the following statements is/are true? Choose all that apply
A. The energy of the starting materials for a reaction will equal the sum of energies of the products plus energy released as heat and disorder. B. The amount of useable energy resulting from a reaction will always be less than the total energy available in the starting materials. C. The entropy of the products of a reaction will always be greater than the entropy of the starting materials. D. The entropy of the starting materials for a reaction will always be greater than the entropy of the products.
Answer the following statements true (T) or false (F)
1. The fins of lobe-finned fish are supported by extensions of the skeleton and are moved by muscles within the fin whereas the fins of ray-finned fish are supported by flexible, nonskeletal elements and are moved by muscles from within the fish's body. 2. Acanthostega is an important fossil for the understanding of phylogeny because it is an intermediate form between lobe-finned fishes and amphibians. 3. The formation of feathers, hair, and reptilian scales is based on completely different developmental patterns and genetic influences. 4. Some dinosaurs had feathers. 5. In previous times, birds and pterosaurs were contemporaries.
Which structure conducts electrical signals from the apex of the heart to the ventricular myocardium, causing the ventricles to contract?
a. arterioles b. sinoatrial node c. Purkinje fibers d. atrioventricular node
Which of the following contraception techniques consists of avoiding intercourse during the time of
the month when the egg can be fertilized?
a. withdrawal b. tubal ligation c. dilation and evacuation d. rhythm method e. time of the month method