When is knowing the host and environmental factors that lead to a disease more important to saving lives than knowing the etiological causative agent?
A) when the host range is very large
B) when the disease is spread through sexual contact
C) when there is no cure for the disease
D) when specific health factors within a person's control are particularly risky
E) when the source of infection is a particular geographical location
Answer: C
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Compact bone contains ____
a. thick concentric layers of extracellular matrix b. spongy marrow c. yellow marrow d. red marrow e. blood arteries
Researchers found an increase of abnormal meiosis in mouse oocytes when the mouse facility started washing the animals’ plastic cages and water bottles in a new, alkaline detergent. The detergent had damaged the plastic, which began to leach bisphenol A (BPA). Looking at the data in this experiment, which hypothesis do the data best support?
1.glass bottles were affected by the alkaline detergent
2.damaged cages had the greatest abnormal meiosis
3.damaged bottles had the greatest abnormal meiosis (26.9%)
4.the effect of damaged cages and damaged bottles was cumulative
Which of the following correctly describes these two figures?
1.The upper figure shows a true coelom while the lower figure shows a pseudocoel.
2.The upper figure is characteristic of vertebrates while the lower figure is typical of flatworms.
3.Animals with the digestive system in the upper figure can only digest liquid foods.
4.In both cases, nutrients can diffuse out of the gut to body cells.
Which of the following pairs is correctly matched?
a. chloroplast?storage of enzymes b. lysosome?powerhouse of the cell c. centrosome?cell division d. plastids?structural support of the cell e. Golgi complex?production of energy