What are the 4 most abundant elements found in living systems?

a. hydrogen, oxygen, calcium, and nitrogen
b. nitrogen, carbon, sulfur, oxygen
c. hydrogen, oxygen, nitrogen and carbon dioxide
d. hydrogen, oxygen, nitrogen and carbon


Ans: d. hydrogen, oxygen, nitrogen and carbon

Biology & Microbiology

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Based on the energy and carbon sources of humans, how would humans be classified?

A. as chemoautotrophs B. as chemoheterotrophs C. as photoheterotrophs D. as photoautotrophs

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What is the sugar molecule found in DNA?

a. ribose b. phosphatase c. deoxyribose d. oxyribose e. polymerase

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How could you use T2 bacteriophage plaque phenotypes to determine the genetic distance between two genes, h and r, that affect plaque appearance in the phage DNA?

What will be an ideal response?

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Molecular lesions of DNA are called _____.

a) point mutations b) broken side rails c) cross-linking d) rung breaks

Biology & Microbiology