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