The site on the DNA to which a repressor protein binds is the ________.
A. promoter
B. operon
C. operator
D. regulator
Answer: C
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Phosphorus reservoirs include
A) phosphate minerals in rocks, dissolved phosphates in aquatic environments, and the nucleic acids and phospholipids of living organisms. B) mineral phosphonates and the nucleic acids and phospholipids of living organisms. C) elemental phosphorus minerals and phosphonates. D) elemental phosphorous, polyphosphate, and phosphonates.
Which portion of the photosynthetic apparatus absorbs light?
A. photosystem II B. NADP reductase C. both photosystem I and photosystem II D. photosystem I E. both photosystem I and NADP reductase
Antibody-mediated responses work against _____
a. intracellular pathogens b. extracellular pathogens c. cancerous cells d. both intracellular pathogens and extracellular pathogens e. both extracellular pathogens and cancerous cells f. intracellular pathogens, extracellular pathogens, and cancerous cells
Which statement about the megasporocyte is true?
a. It undergoes meiosis to produce three haploid cells. b. It is a diploid cell located within an ovule. c. It divides mitotically to form a male gametophyte. d. It plays an important role in cross-pollination. e. It will give rise to the generative cell.