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. Receptor-mediator endocytosis
B. Phagocytosis
C. Exocytosis
D. Pinocytosis
Answer: A
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Lymphogranuloma venereum is a sexually transmitted disease caused by distinct strains of ________
A) Chlamydia trachomatis B) herpes simplex 2 virus (HSV-2) C) Neisseria gonorrhoeae D) Haemophilus ducreyi
Which amino acid is MOST likely to be found in the core of a protein?
A) methionine B) glutamic acid C) threonine D) asparagine E) serine
Reproductive isolation in Darwin's finches was studied by Podos. He measured beak size and found a correlation between this and the finches'
A. song and ability to attract certain mates. B. flight patterns and song. C. ability to attract certain mates. D. flight patterns. E. song.
Twitching or gliding motility involves
A. type IV pili. B. movement of slime. C. axial fibrils. D. both type IV pili and movement of slime can be involved in twitching or gliding motility.