Once you have had a primary exposure to a specific antigen and encounter this antigen again, you will mount a rapid immune response due to:
A) memory cells. B) antigen-presenting cells.
C) cytotoxic T cells. D) antibodies.
Answer: A
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What will be accomplished by lowering the activation energy of a reaction?
A. The reaction will proceed more slowly. B. The reaction will reverse. C. The reaction will stop completely. D. The reaction will proceed more quickly.
Deserts across the globe are typically characterized by low rainfall and plants and animals that
are well adapted to hot and dry conditions. As such, deserts are an example of a __________.
a. life zone b. habitat c. niche d. limiting resource
The separation of members of a gene pair from each other during gamete formation is called ____________________. Fill in the blank(s) with the appropriate word(s)
Horsetails belong to the phylum Pteridophyta
____________________ Indicate whether the statement is true or false.