Suppose you discover an organism that has a nucleus but no mitochondria. What could this organism be?
a. a kinetoplastid
b. a euglenoid
c. a ciliate
d. a diplomonad
Ans: d. a diplomonad
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________ is a chemical message sent by another individual.
a. Pheromone
b. Proprioception
c. Thermoception
d. Phenome
You take absorbance readings on a spectrophotometer across a 6-hour culture of E. coli cells growing in tryptic soy broth (TSB). Your absorbance readings clearly indicate a lag phase, a log phase, and a stationary phase
You come back in and take readings at 8, 10, 12, 14, and 16 hours, but the absorbance number remains the same. Shouldn't it start coming down as the closed batch culture enters death phase? What's the most likely thing that is happening? A. Clearly, something is wrong with the spectrophotometer and it isn't measuring the correct values. Perhaps something is on the detector, making it register falsely high absorbance numbers. B. When we establish a growth curve, we should actually plot the log of the number of viable cells vs. time. However, a spectrophotometer can only measure absorbance. Absorbance is NOT the same as the number of viable cells. Many of the cells in the tube are most likely dead, but the machine can't discriminate between a live cell and a dead one. This keeps the absorbance high even into the death phase. C. It'll happen-E. coli just grow slowly. We haven't gotten to the end of the stationary phase yet. Be patient! D. Perhaps there's a big smudge of something on the tube that is blocking some of the light. This would lead to an elevated reading for every timepoint after the smudge was placed on the tube.
Hemoglobin A1c can be measured in blood tests to track the progress of which disease?
A) liver disease B) kidney disease C) heart disease D) diabetes E) anorexia
Susan ran a beef slaughterhouse. At the end of a very long day in which many cattle were processed, she found that there were several pounds of thyroid gland, unsalable as such. Therefore, she ordered the glands be ground into hamburger meat. If someone
were to buy, cook, and eat all of that thyroid-burger, what serious outcome would you predict for that customer? What will be an ideal response?