Whenever the body is reexposed to a sensitizing agent, the IgE antibodies cause
a. the production of prostaglandins and histamine.
b. the release of antihistamines.
c. suppression of the inflammatory response.
d. the production of clonal cells.
e. mast cells to become inactive.
A
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Communication between cells always involves four components, including a signaling cell, a signaling molecule, a receptor, and a target responding cell. Mark each of the following statements about cell communication true or false
____ Signaling molecules are always secreted from the signaling cell. ____ The distance travelled by the signaling molecule to the responding cell varies tremendously depending on the signal. ____ A specific signaling molecule may bind to receptors on more than one kind of cell. ____ Receptors for signaling molecules are always integral membrane proteins on the surface of responding cells. ____ Signaling molecules involved in endocrine signaling are always hydrophobic hormones like testosterone. ____ Peptide signaling molecules are only involved in paracrine or autocrine signaling. What will be an ideal response?
The probability of rolling a die twice and getting a 2 and a 6 in no particular order is
a. 1/3 b. 1/4 c. 1/8 d. 1/18 e. 1/36
Chromatin remodeling involves both sliding and relocating of the nucleosomes. Which eukaryotic chromatin remodeling complex is likely involved?
A) ISWI complex B) SWR1 complex C) SWI/SNF complex D) SHH complex E) Mig1 complex
Provide a brief explanation of the relationship between amino acid sequences in proteins and
nucleotide sequences in DNA and what they can reveal about evolutionary relationships What will be an ideal response?