"Immediate early genes" such as myc can best be thought of as genes that
a) Are only expressed in the absence of growth factor (GF) stimulation
b) Become permanently switched off during tumorigenesis
c) Code for GF receptors such as RTKs
d) Represent the first wave of expression following GF stimulation
Answer: d) Represent the first wave of expression following GF stimulation
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Which of the following mutations would be most likely to have a harmful effect on an organism?
A) a nucleotide-pair substitution B) a deletion of three nucleotides near the middle of a gene C) a single nucleotide deletion in the middle of an intron D) a single nucleotide deletion near the end of the coding sequence E) a single nucleotide insertion downstream of, and close to, the start of the coding sequence
Match the following items with the correct phrases.
_______1. Immune complex reactions; antigen-antibody complexes become deposited in tissue (e.g., the glomeruli of the kidneys), resulting in inflammatory damage. _______2. Anaphylactic reactions; examples include hayfever symptoms, hives, asthma, and the anaphylactic shock that could follow a bee sting or administration of penicillin. _______3. Cell-mediated reactions; antibodies don't play a major role. _______4. Cytotoxic reactions; involve the lysis of cells; the adverse reactions that follow incompatible blood transfusions are an example. a. type I hypersensitivity reactions b. type II hypersensitivity reactions c. type III hypersensitivity reactions d. type IV hypersensitivity reactions
Choose the letter that best describes the function of this receptor type: Ruffini corpuscle
A. tonic receptors located near the surface of the skin B. pressure sensitive receptors deep in the subcutaneous layer C. receptors on the face and fingertips sensitive to light touch
Which of the following would not be the origin of the bacteremia leading to endocarditis?
A) venous catheters B) urinary tract infections C) infected gums D) pneumonia E) skin abscesses