When cytosolic levels of iron increase, intracellular ferritin levels will
A. drop until iron levels increase further.
B. increase.
C. decrease.
D. fluctuate by increasing and decreasing in a random fashion.
E. not change.
Answer: B
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Which one of the following is a major difference between integrins and cadherins?
A. Integrins are integral membrane proteins, whereas cadherins are not. B. Cadherins are found in cellular junctions, whereas integrins are not. C. Integrins allow cells to adhere to extracellular matrix, whereas cadherins do not. D. Cadherins associate with intermediate filaments, whereas integrins do not.
A rare genetic disorder called Gaucher disease may strike as many as one in 450 people of ____ descent
a. Middle Eastern
b. Western European c. African American d. British e. Eastern European
People who undergo radiation therapy sometimes develop anemia resulting from a decreased production of red blood
cells. This is because radiation affects:a. spongy bone. b. osteoblasts. c. osteoclasts. d. lacunae. e. metaphysis.
Despite its name, Kentucky Bluegrass is a widespread turfgrass used for lawns throughout the United States. In some regions, strains have developed desirable disease-resistant properties. However, Kentucky Bluegrass typically develops by apomixis. Plant breeders say this creates both a challenge and an opportunity for engineering novel strains. Why?
A. If a seed develops by apomixis, it will be identical to its parent. Hybridization with another strain requires special techniques. However, once a hybrid strain is developed, apomixis ensures its reliable propagation. B. In apomixis, new plants develop from underground horizontal stems. This allows for fast propagation of new strains, but all progeny are identical to the parent. C. Plants that develop by apomixis are naturally tolerant of herbicides. As a result, herbicide tolerance genes cannot be used as selectable markers for a transgene, but herbicides can be used to keep the resulting culture pure. D. Since the progeny of apomixis are triploid, hybrids have an imbalance of parental genes. However, this may be desirable if a higher proportion of one allele is beneficial.