Specific immunity provides long-lasting protection through the production of ________.

A. antibodies
B. T helper cells
C. memory cells
D. phagocytotic cells
E. plasma cells


Answer: C

Biology & Microbiology

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________ used X-ray diffraction to deduce the helical shape of DNA.

A) Linus Pauling B) James Watson and Francis Crick C) Martha Chase D) Rosalind Franklin

Biology & Microbiology

Amino acids are carried to ribosomes by____ RNA

a. template b. messenger c. transfer d. ribosomal e. retriever

Biology & Microbiology

As elevation increases, the number of terrestrial species ________

Fill in the blank(s) with correct word

Biology & Microbiology

The term autotroph refers to an organism that

A. must obtain organic compounds for its carbon needs. B. gets energy by oxidizing chemical compounds. C. does not need a carbon source. D. gets energy from sunlight. E. uses CO2 for its carbon source.

Biology & Microbiology