Which neurotransmitter appears to be associated with an energizing "good" feeling and is essential in hunger, thirst, and sex drive?
A) synapse B) serotonin C) norepinephrine D) dopamine
Answer: C
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____ factors determine which type of algae species will predominate in tide pools in New England
a. Bottom-up b. Top-up c. Abiotic d. Biological e. Physical
Which of the following statements regarding the cell-mediated immune response is TRUE?
A) Cytotoxic T lymphocytes do not require antigen presentation to become activated. B) Cytotoxic T lymphocytes interact with antibodies that have bound antigen to identify their target. C) Helper T lymphocytes have no role in the activation of cytotoxic T lymphocytes. D) Cytotoxic T lymphocytes kill by producing hydrogen peroxide. E) A single cytotoxic T lymphocyte can kill many target cells.
Single-celled organisms known as diatoms have glasslike walls and are a type of algae
Indicate whether the statement is true or false
A protein, like the lac repressor, is said to be ________ because when it binds lactose, it structurally changes and its chemical activity also changes
A) digestive B) allosteric C) structural D) enzymatic E) multimeric