Past Exam 2019 Flashcards
Histones and DNA have a strong attraction for each other because
DNA is negatively charged and histones are positively charged
Histones appear to have a singular role in the packaging of DNA. The nonhistone proteins in chromatin have all of the following functions except
Forming the nucleosome core
The first level of compaction of DNA consists of
DNA, winding around histones to form small nucleosomes
The two chromatids of each replicated chromosome must separate from one another and segregate during
mitosis and meiosis 2
If the codon (UAC) specifies the amino acid tyrosine what would be the other codon that specifies the same amino acid
UAU
In the poly-A tail of the mRNA, how many adenines are usually found
100-200
Which of the following is a stop codon
UGA, UAA, UAG
How many different amino acids could be coded for using the synthetic mRNA sequence of (5’UGCUGCUGC3’)
1 - UGC repeated 3 times
The appearance of a novel phenotype resulting from the substitution of a single base pair might be due to
All of the above
Change in amino acid sequence only
Alternation in a gene that codes for a nontranslated RNA
Change in the amount of protein expressed
Change in the development time or location at which a gene is expressed
Assume that a wild-type sequence is 5’AGCCTAC3’. Indicate the sequence that might be produced by a transversion
5’ATCCTAC3’
Unequal crossing over results in
A creation of deletions and duplications
Choose the interaction listed below that is not involved in maintaining tertiary structure in protein molecules
Halogen bond
Trisomy 13 is termed _____?
Patau
Duplications arise by any of the following except
Alkylating mutagens
Triploid organisms usually result from
The union of haploid and diploid gametes
