Matt is studying how the protein transferrin enters cells. He examines cells that have taken up transferrin, and finds clathrin-coated vesicles. What mechanism was used to take transferrin into the cell?
A. phagocytosis
B. pinocytosis
C. receptor-mediator endocytosis
D. exocytosis
Answer: C
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If both parents are "carriers" due to the presence of one copy of the Tay-Sachs allele, what are the odds that they would have a normal child?
a. 0 b. 25% c. 50% d. 75% e. 100%
Which of the following environments would be
most likely to produce trees without annual rings? a. tropical rain forest b. northern evergreen forest c. areas with alternating wet and dry seasons d. temperate-deciduous forests e. none of these, because annual rings are characteristic of all trees
The ________ is the minimum energy required before two molecules can be successful in producing a reaction
Fill in the blank with correct word.
What is most likely to occur if a parasite accidentally introduced into the Great Lakes kills 95% of all living organisms
living in the lakes? a. fusion in a hybrid zone b. evolution of a surviving organism c. mass extinction of the surviving organisms d. adaptive radiation of the surviving populations e. allopatric speciation in the surviving organisms