Diapedesis is the movement of white blood cells through intact blood vessel walls into surrounding body tissue. It typically happens when an area of the body is injured or damaged, and an inflammation response is required. What role would you expect cell adhesion molecules to play in this process?
A. Cell adhesion molecules will allow the white blood cells to attach to the injured area so they become immobile.
B. Cell adhesion molecules help white blood cells adhere to the blood vessel wall so that they can migrate across the wall and infiltrate into the underlying tissue.
C. Cell adhesion molecules will allow the white blood cells to cling to one another to form a migrating clot.
Answer: B
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Gram-positive bacteria such as Propionibacterium acnes limit the growth of gram-negative bacteria and some fungi on the human skin by converting secreted ________ to compounds with antimicrobial activity.
A. urea B. lipids C. organic acids D. salts
The base analog 5-bromouracil can tautomerize. One tautomer behaves like thymine and the other behaves like cytosine. If 5-bromouracil is used as a mutagen, what is the minimum number of times replication must occur to mutate the codon for proline (CCC) into the codon for serine (TCC)?
A) one generation B) two generations C) three generations D) 5-bromouracil cannot induce this mutation
Blood plasma is 90% water.
Answer the following statement true (T) or false (F)
Cells that have two copies of each type of chromosome are ________.
a) duplicated b) haploid c) abnormal d) diploid