When cells associate with each other they form
A. atoms.
B. molecules.
C. macromolecules.
D. tissues.
E. populations.
D. tissues.
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Which of the following is true of supercoiling?
A. The relaxed form of DNA is more stable and is therefore the preferred form in the cell. B. Most organisms maintain their DNA in a slightly overwound state in order to enhance strand separation during transcription and replication. C. Overwound DNA is in the B form so relaxed DNA has less turns than B-form DNA. D. Most organisms maintain their DNA in a slightly underwound state in order to compact their DNA. E. The relaxed form of DNA can only be maintained if the DNA is a closed circle.
Which of the following statements is incorrect?
A) Enzymes raise the activation energy of a reaction. B) Enzymes speed up the rate of a reaction. C) Substrates bind to an enzyme's active site. D) Enzymes change shape when they bind to a substrate.
Most marine invertebrates are osmoconformers. This means that
A. that their body fluids contain the exact same solutes in the same concentration as their cells. B. that their body fluids contain the exact same solutes in the same concentration as their surroundings. C. the osmolarity of their body fluids is the same as their seawater environment. D. the osmolarity of their body fluids fluctuates between hypertonic to hypotonic depending on the season and the tides. E. the osmolarity of their body fluids is equal to that of the osmoregulators who inhabit the same environments.
Which of the following is NOT a function of transposase?
A. Transposase recognizes inverted repeats. B. Transposase cleaves at both ends of the transposable element. C. Transposase carries the transposable element to a new site on the DNA. D. Transposase cleaves the target DNA at staggered sites. E. Transposase ligates nucleic acid fragments during DNA replication.