Why are the secretions of the seminal vesicles, prostate glands, and bulbourethral glands necessary for successful reproduction?
What will be an ideal response?
They activate swimming by the sperm, provide energy to the sperm, and neutralize the acids of the vagina.
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The secretory systems of Type III and Type IV pathogenic bacteria differ in their mode of attacking cells in which of the following ways?
A. Type III systems bind to the cellular membrane by slimy mucilage and toxins diffuse across the membrane, whereas Type IV systems infect materials using pili as transfer tubes. B. Type IV systems bind to the cellular membrane by slimy mucilage and toxins diffuse across the membrane, whereas Type III systems infect materials using pili as transfer tubes. C. Both systems attach to cells in the same way but they differ merely in the chemicals that they inject into the host cell. D. Type III systems use flagella modified as "syringes" to inject materials into cells they are infecting whereas Type IV systems use modified pili as transfer tubes. E. Type IV systems use flagella modified as "syringes" to inject materials into cells they are infecting whereas Type III systems use modified pili as transfer tubes.
________ microbes are used to measure oxygen availability, UV radiation dose, pollutant or toxic chemical effects, and stress.
Fill in the blank(s) with the appropriate word(s).
It is thought that President Abraham Lincoln suffered from a genetic disorder known as Marfan syndrome. Which types of fibers are affected in this disorder?
A. collagen fibers B. hyaline fibers C. elastic fibers D. reticular fibers E. ground fibers
In general, which of the follwoing will diffuse across a lipid bilayer most rapidly.
a. Small hydrophillic molecule b. Small hydrophobic molecule c. Large hydrophillic molecule d. Large hydrophobic molecule