Which on of the following is not an effect of complement activation?
A. Formation of an attack complex
B. Attraction of phagocytes and enhancement of phagocytosis
C. Lysis of the cell through cytoplasmic leakage
D. Increased blood vessel permeability
E. Degradation of mRNA, cessation of protein synthesis and apoptosis
Answer: E. Degradation of mRNA, cessation of protein synthesis and apoptosis
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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?
Starch and cellulose can provide animals with energy only if they are first broken down into ________molecules
a. water b. glucose c. sucrose d. carbon dioxide e. amino acids
How can you use the known human cDNA gene sequence for cytC that you already have in an experiment(s) to identify and compare the sequences from other vertebrates?
What will be an ideal response?
The amount of dissolved oxygen in the water is an important factor used to assess the health of a lake. What is the relationship between the temperature of the water and the concentration of dissolved oxygen?
A) Cooler water temperatures prevent oxygen from being dissolved in the water. B) Warmer water temperatures decrease the amount of oxygen that can be dissolved in the water. C) Water temperature does not affect the amount of oxygen dissolved in the water. D) Warmer water temperatures increase the amount of oxygen that can be dissolved in the water.