A virus is composed of each of the following except:
A) capsid
B) proteins
C) DNA or RNA
D) ribosomes
Ans: D) ribosomes
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How do transcription repressors work?
a. They bind to the same sequence where activators normally bind. b. They bind to and disable the activator. c. They recruit histone acetylation enzymes and thus interfere with chromatin remodeling. d. They bind to RNA polymerase II and prevent it from binding to the transcription factor complex e. They methylate DNA.
The switching between asexual and sexual
reproduction by water fleas is controlled by
a. epistasis. b. pleiotropy. c. incomplete dominance. d. codominant inheritance. e. environmental effects
Which of the following statements about the electron transport chain is true?
a. Protons are pumped out of the mitochondria by the complexes of the electron transport chain. b. The proton gradient established during electron transport is a form of potential energy. c. The electron transport chain can be found in the mitochondria of aerobic bacteria and other cells. d. The movement of protons down a concentration gradient is an endergonic process. e. ATP synthesis associated with the electron transport chain is an example of substrate level phosphorylation.
To test for the presence of starch, iodine can be used. A positive reaction results in a black color. A dialysis bag filled with starch solution and secured on both ends is placed in iodine solution. After 30 minutes the dialysis bag appears black. Based on this information, what most accurately describes what happened?
A. Due to its size and polarity, iodine was able to enter the dialysis bag and interact with starch. B. Over time, both iodine and starch are equally distributed throughout the two solutions. C. Due to its size and polarity, starch was able to exit the dialysis bag and interact with the iodine solution.