Antigen receptors give __________ the collective potential to recognize billions of different antigens. Fill in the blank(s) with the appropriate word(s)
ANSWER: lymphocytes
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The primary purpose(s) of viral cultivation is/are to
A. prepare viruses for vaccines. B. isolate and identify viruses in clinical specimens. C. do detailed research on viral structure, lifestyle, genetics, and effects on host cells. D. perform wide-scale harvesting of viruses. E. All of the choices are correct.
The imprinting control region (ICR) involved in genomic imprinting on chromosome 15 is what type of sequence?
A) enhancer B) insulator C) silencer D) promoter E) intronic
Which of the following is NOT produced by either the ovaries or testes?
a. testosterone b. estrogen c. progesterone d. follicle-stimulating hormone e. androgens
Which of the following is a synapomorphy that defines all green algae and land plants?
A. Cell walls B. Vascular tissue C. Photosynthetic chloroplasts D. Seeds