Which of the following identifies a group of DNA viruses?
a. retroviruses
b. herpesviruses
c. paramyxoviruses
d. filovirus
e. picornaviruses
B
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Effector B cells
a. secrete antibodies identical to those of the original B cell from which they arose. b. secrete antibodies that are different than the original B cell from which they arose. c. present bound antibodies identical to those of the original B cell from which they arose. d. present bound antibodies different than those of the original B cell from which they arose. e. secrete cytokines
How do restriction enzymes work?
1.They recognize sticky ends and quickly restrict their binding. 2.They recognize and cut only specific sequences going backwards and forwards in the DNA. 3.They help to paste DNA from different organisms into cloning vectors. 4.They restrict plasmids from being taken up by host cells.
If a woody plant in dormancy is placed in a
greenhouse so that only one limb is exposed to the cold winter temperatures, eventually the a. whole plant breaks dormancy and starts growing. b. parts of the plant that were inside the greenhouse start blooming. c. limb exposed to the low temperature dies. d. limb exposed to the low temperature breaks dormancy. e. limb exposed to the low temperature never forms seeds.
What is the "true body cavity" called?
a. Endoderm b. Mesoderm c. Coelom d. Triploblastic