Initiator proteins bind to replication origins and disrupt hydrogen bonds between the two DNA strands being copied. Which of the factors below does not contribute to the relative ease of strand separation by initiator proteins?
(a) replication origins are rich in A-T base pairs
(b) the reaction can occur at room temperature
(c) they only separate a few base pairs at a time
(d) once opened, other proteins of the DNA replication machinery bind to the origin
(b)
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Restriction enzymes are
A. proteases. B. lipases. C. endonucleases. D. exonucleases.
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What would be strong evidence to suggest a protist is phagotrophic?
A. Benthic lifestyle B. Silicon dioxide cell walls C. An abundance of lysosomes D. Presence of chloroplasts E. Locomotion using polar flagella
The cells of plasmodial slime molds can grow to several centimeters in diameter because
A) they have organelles. B) they distribute nutrients by cytoplasmic streaming. C) the large surface can absorb nutrients. D) they form spores. E) they have a mouth to ingest nutrients.