Which of the following types of cellular activities can be a response to cell signaling?
A. Cell division is triggered.
B. Gene expression patterns are changed.
C. Enzyme activity patterns are changed.
D. Cell signals are released to communicate
with other cells.
E. All of these choices are correct.
E
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The last common ancestor of all animals was probably a _____
A) unicellular chytrid B) unicellular yeast C) multicellular algae D) multicellular fungus E) flagellated protist
What is the most likely cause of the excessive growth exhibited by the person in the center of the accompanying
figure? a. pituitary tumor b. lack of GH receptor response c. low levels of rhGH d. cretinism e. Laron syndrome
Which of the following contains the most species of living things?
A) biosphere B) niche C) ecosystem D) community
Foods can be preserved in many ways by slowing or preventing bacterial growth. Which of these methods should be LEAST effective at inhibiting bacterial growth?
A) Refrigeration: slows bacterial metabolism and growth. B) Closing previously opened containers: prevents more bacteria from entering, and excludes oxygen. C) Pickling: creates a pH at which most bacterial enzymes cannot function. D) Canning in heavy sugar syrup: creates osmotic conditions that remove water from most bacterial cells.