During the denaturation step of PCR, ____ bonds are broken when DNA is heated
a. hydrogen
b. double-stranded
c. ionic
d. metallic
e. covalent
a
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Allergic reactions are triggered by the production of ____ antibodies instead of ____ antibodies at the first exposure to the allergen
a. IgA; IgD b. IgA; IgE c. IgE; IgM d. IgE; IgG e. IgG; IgE
The amplitude of a sound wave corresponds to ____
a. loudness b. direction c. frequency d. timbre e. pressure
Which of the following is a weakness of the biological species concept?
A. It relies on the subjective judgment of experts to decide whether populations are similar enough to be the same species. B. It requires phylogenetic trees, which haven't been estimated yet for many lineages. C. It is not applicable to sexually reproducing species because the offspring are genetically distinct from the parents. D. It isn't applicable to asexual, fossil, or geographically isolated species.
The lymphatic system differs from the bloodstream in that
A) the bloodstream is a one-direction system. B) the lymph is moved via the help of a pump that pushes the fluid through the vessels. C) the lymph system is a multi-directional system with vessels concentrated at the "dead-end" areas of the hands, feet, and breast. D) lymph flow is dependent on muscle movement.