Complement proteins are part of ________ immunity.
A. adaptive
B. innate
Ans: B. innate
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Heterocysts
A. are found in nitrogen-fixing cyanobacteria. B. are used to protect nitrogenase. C. produce catalase. D. generate oxygen. E. are found in nitrogen-fixing cyanobacteria AND are used to protect nitrogenase.
Marine biology is the study of:
a. the living organisms that inhabit the sea. b. the oceans and their phenomena. c. the oceans and living organisms. d. the chemical makeup of the oceans. e. biogeochemical processes.
The white cliffs of Dover are composed mostly of foraminiferans shells. These organisms move by pseudopodia and feed by phagocytosis. Foraminiferan shells are made of which of the following?
a. Cellulose b. Calcium carbonate c. Chitin d. Peptidoglycan e. Silica
DNA is composed of four nucleotides, A, C, G and T. Each codon is composed of three nucleotides. The number of possible codons is
A) 16. B) 4. C) 12. D) 64. E) 32.