Humans function primarily at which trophic levels?
A) primary consumers; secondary consumers B) producers; primary consumers
C) all trophic levels D) secondary consumers; tertiary consumers
Answer: A
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Which of the following statements are true regarding heavy (H) chains? Select all correct choices
A. Antibodies contain two heavy chains. B. Heavy chains contain variable and constant regions. C. Heavy chains are formed by the recombination of V, J, and C gene segments. D. Heavy chains are formed by the recombination of V, J, C, and D gene segments. E. Heavy chains contain only a hypervariable region.
Tetanus is caused by a toxin produced by
1. Clostridium botulinum 2. Clostridium tetani 3. Clostridium perfringens 4. Clostridium welchii 5. Clostridium dificil
In Figure 3.1, line "b." points to the microscope's
a. Illuminator. b. Condenser. c. Ocular lens. d. Objective lens.
The phosphorylation of a protein is typically associated with a change in activity, the assembly of a protein complex, or the triggering of a downstream signaling cascade
The addition of ubiquitin, a small polypeptide, is another type of covalent modification that can affect the protein function. Ubiquitylation often results in ______________. (a) membrane association. (b) protein degradation. (c) protein secretion. (d) nuclear translocation.