Transmembrane movement of a substance down a concentration gradient with no involvement of membrane proteins is called ________
Fill in the blank with correct word.
Answer: simple diffusion
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Answer the following statements true (T) or false (F)
1. The membrane attack complex is involved in specific immune defense mechanisms. 2. The three major types of pathogens are bacteria, viruses, and cancer. 3. Helper T cells activate both B cells and cytotoxic T cells. 4. The first stage of a specific immune response is the activation of B cells and T cells. 5. Hypermutation refers to the process by which immunoglobulin gene domains recombine to form a diverse array of antibodies.
Which of the following is true regarding diffusion?
a. The larger the solute, the faster diffusion will occur. b. The colder the temperature, the faster diffusion will occur. c. The fewer solute particles in a solution, the faster diffusion will occur. d. The less dense a solvent is, the faster diffusion will occur.
Cellular slime molds can be distinguished from plasmodial slime molds on the basis of
a. reproductive structures. b. spore formation. c. nuclei per cell. d. slime trails. e. food requirements.
Which region experienced a desertification event called the Dust Bowl in the 1930s?
a. Europe b. North America c. South America d. East Asia e. Central Africa