Explain why X-ray diffraction was important in the study of DNA structure and describe the procedure used in X-ray diffraction
What will be an ideal response?
X-ray diffraction studies provided clues to the helical structure of DNA. In X-ray diffraction, molecules are placed in an X-ray beam, and as the beam passes through the molecule, some X-rays are deflected by atoms in the target molecule. The pattern of X-rays that emerges is recorded and analyzed to produce information about the organization and shape of the molecule.
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A child swinging on a swing utilizes which type (or types) of energy?
a. kinetic energy only because the child is in constant motion b. potential energy only, because the child has to invest energy to get the swing to go c. chemical energy only, because it is the child's metabolism that powers the muscles that make the swing move d. kinetic and potential energy only, but in constantly changing ratios: when changing direction it is pure potential energy; at the bottom of the arc, it is pure kinetic energy e. kinetic, potential, and chemical energy. The child powers the swing with chemical energy in the muscle cells and the swing moves like a pendulum with changing ratios of kinetic and potential energy.
A divergence from _____ gave rise to tetrapods
a. ray-finned fishes c. cartilaginous fishes b. lizards d. lobe-finned fishes
Provide three diseases caused by protozoa. Include the causal organism, the group in which it is classified, and its
means of transmission when possible. What will be an ideal response?
The five stages of a lytic infection are attachment, penetration, __________, assembly, and release
a. lysis b. prophage c. replication d. lysogenesis e. transduction