Which of the following are correct pairings of histone variants and their functions?
A. H3.3 ? stabilizes the open state (transcriptionally active)
B. CENPA ? maintains kinetochore attachment
C. H2AX ? DNA repair
D. macroH2A ? X chromosome inactivation
E. All of these choices are correct.
E
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Depending on the type of regulatory mechanism, activators and repressors can bind to operator regions which control transcription
Indicate whether the statement is true or false.
Hoogsteen base pairing:
A. can result in the formation of a tetraplex DNA from stretches of G residues. B. causes additional paring of an A to an existing A-T pair such that the T is bound to both Abases. C. can result in triplex DNA formation in stretches of DNA containing alternating purines and pyrimidines. D. results in triplex DNA in which all three strands are composed of purines only. E. can result in the formation of triplex DNA within long sequences containing only pyrimidines or only purines in a given strand.
In the nucleotide sequence ACTGG, what does C stand for?
a. cysteine b. cytotoxic c. cytosine d. chargaff e. cytoplasm
The following are differences between amphibians and reptiles EXCEPT
A. amphibian eggs are laid in water, but reptiles do not require water for reproduction. B. amphibians have smooth non-scaly skin, whereas reptiles are covered with scales and their skin is dry. C. reptiles are ectothermic, while amphibians are endothermic. D. all reptiles respire by the use of lungs, while amphibians use small lungs supplemented by cutaneous respiration.