Protection from infection known as species resistance is a result of
A. the lack of suitable environment in the body.
B. the absence of receptors required for microbial attachment.
C. the presence of phagocytes in the tissues.
D. the salty, acidic condition of normal skin.
E. both the absence of necessary receptors and lack of suitable environment in the body.
Answer: E
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The use of organs harvested from animals for human transplants is called ____________________
Fill in the blank(s) with correct word
Lysosomes originate from the
A. Golgi apparatus. B. endoplasmic reticulum. C. mitochondria. D. chloroplast.
____ are the outermost layer of the periderm of woody trees
a. Epidermis. b. Secondary xylem c. Cork cambium d. Cork parenchyma e. Cork cells
Gene flow ____.
A. has a stabilizing influence on allele frequencies between two populations B. speeds up the divergence of two populations C. increases divergence between populations D. is promoted by isolating mechanisms E. promotes inbreeding