The structure that associates homologous chromosomes and keeps them aligned during meiotic prophase is called a
a. chiasma.
b. synaptonemal complex.
c. centromere.
d. pachytene complex.
Ans: b. synaptonemal complex.
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In adult arthropods, the hemocoel _____
A) provides space for the internal organs to grow and function B) forms a cavity to protect the visceral mass of organs C) acts as a hydrostatic skeleton for mobility D) secretes the exoskeleton
After melting a significant quantity of lab equipment during a previous experiment, your colleague decides to recoup his losses by synthesizing trendy vitamin-infused beverages for sale during his off time. He knows that the vitamins he’s chosen won’t dissolve in water, so he’s planning to dissolve them in oil and then blend the vitamin-oil solution into soda water. What’s the flaw in your colleague’s plan?
a. Soda water will leach vitamins from the oil, causing them to settle out of the beverages. b. Vitamins are only soluble in trans fats, which will negate the health benefits of his products. c. Oils are hydrophobic, so his beverages will separate before they can be consumed. d. Carbonation in soda water will cause the fatty acids to decompose into alcohol.
A person you know has been in an automobile accident. The accident caused a dramatic personality change. Before the accident, he was industrious and well liked; after the accident, he is profane, impetuous, and incapable of working toward a goal
Which portion of the brain was most likely damaged? A) Hypothalamus B) Hippocampus C) Temporal lobe D) Frontal lobe E) Parietal lobe
The noninfective, obligately intracellular forms of chlamydia are called
A) elementary bodies. B) phagosomes. C) pseudohyphae. D) trachomas. E) reticulate bodies.