Parental care in dinosaurs, crocodiles, and birds is an example of
A. homoplasy caused by convergence.
B. homoplasy caused by common descent.
C. homoplasy caused by evolutionary reversal.
D. homology caused by convergence.
E. homology caused by common descent.
E. homology caused by common descent.
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Researchers generally insert engineered Ti plasmids into plant cells by ________
a. electric shock b. inserting the plasmid into A. tumefaciens and allowing the bacteria to infect a plant c. chemical shock d. coating microscopic bullets with the plasmid and shooting them into a plant cell
The experiments of Palade and colleagues, using incorporation of labeled amino acids, defined the pathway taken by secreted proteins as
a. rough ER, smooth ER, Golgi, secretory vesicles, cell exterior. b. rough ER, smooth ER, Golgi, endosomes, cell exterior. c. rough ER, Golgi, endosomes, cell exterior. d. rough ER, Golgi, secretory vesicles, cell exterior.
Which of the following cell types produce antibodies?
a) t- cells b) dendritic cells c) b- cells d) natural killer cells
Ethidium bromide
a. terminates the formation of polynucleotide chains. b. is used to detect a protein of interest. c. is a nonspecific stain for nucleic acids. d. is a nonspecific nuclease. e. allows DNA polymerase to be thermostable.