Comparing cells synthesizing secretory proteins and cells secreting steroid hormones, the cells synthesizing the steroid hormones have
A) more rough ER.
B) more smooth ER.
C) equal amounts of smooth and rough ER.
D) equal amounts of smooth and rough ER, but more lysosomes.
E) equal amounts of smooth and rough ER, but fewer lysosomes.
Answer: B
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Which members of Platyhelminthes are parasitic?
a. Planarians and cnidarians b. Flukes and planarians c. Flukes and cnidarians d. Planarians and tapeworms e. Flukes and tapeworms
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.
Which of the following describes a prion?
a. enveloped viral particle with double-stranded DNA enclosed by a capsid b. infectious RNA particle c. infectious proteinaceous particle with no associated nucleic acids d. a simple prokaryote with only a membrane and a nucleoid region
You read about how learning preparedness influences the associations that an animal is capable of learning. You want to explore the learning preparedness of hamsters. How might you test the learning preparedness of this species?
A. Train hamsters to choose between tunnels to find a reward, and mark the tunnels with different visual, tactile, chemosensory or auditory stimuli to see which associations are learnable. B. Train hamsters to navigate a maze to reach a reward. Determine which hamsters are fastest -- thus, are most prepared to learn. C. Train hamsters to navigate a maze to reach a reward. Determine the time of day at which the hamsters are fastest -- thus, most prepared to learn. D. Train hamsters to choose between tunnels to find a reward. Switch the reward tunnel frequently, and determine which hamsters learn the new association the fastest.