Polyploidy may arise from the failure of chromosomes to separate during cell division or by the fertilization of an egg
by more than one sperm.
_________________ Indicate whether the statement is true or false.
True
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How do negative regulators such as the Lac repressor prevent RNA polymerase from initiating transcription?
A) by blocking the ribosome binding site B) by forming a loop in the operator that restricts the passage of the polymerase C) by physically blocking the DNA binding site of RNA polymerase D) by binding to the polymerase to inhibit its catalytic activity
A particular species of protist has obtained a chloroplast via secondary endosymbiosis. You know this because the chloroplasts _____
A) have nuclear and cyanobacterial genes B) are exceptionally small C) have three or four membranes D) have only a single pigment
The stage of mitosis characterized by the physical separation of sister chromatids is called
A. telophase. B. anaphase. C. prometaphase. D. metaphase.
If the ?G of a reaction was -31.45 kJoules, you would know that
A. the reaction is spontaneous. B. the reaction requires an energy input of 31.45 kJoules to proceed. C. the reaction most likely leads to development of a more ordered system. D. the products have more free energy than the reactants.