BMS 528: Exam 1 - CH 21 - Genes ,
Genomes, and Chromosomes Question
and answers 100% correct
How does the packaging of bacterial(prokaryote) DNA occur? - correct
answer ✔- negative supercoiling
- genome is organized into separate loops
-located in nucleoid
What is each loop of the supercoiling bound to? - correct answer ✔protein
How many chromosomes per cell do bacteria have? - correct answer ✔one
(with a single copy of each sequence)
nucleoid exists in - correct answer ✔cytosol
How does the packaging of eukaryote DNA occur? - correct answer ✔-
compacted with histones
- in nucleus
Is reassociation a slower process for single copies or repeated sequences of
DNA? - correct answer ✔single copies
eukaryotes have 2
single sequence reassociation occurs - correct answer ✔slowly
multiple copies reassociation occurs - correct answer ✔quickly
, Are A-T or G-C repeats in DNA more dense than average DNA composition?
At are normally how many copies
GC are normally how many copies - correct answer ✔G-C
(A-T is actually less dense)
AT- multiple
GC-1
Satellite sequences are what? - correct answer ✔non-coding regions
What is thought to be the function of satellite DNA? - correct answer
✔Structural support (high concentration near centromeres)
How much of the total genome is composed of satellite DNA? - correct
answer ✔10-20%
What are Alu sequences? - correct answer ✔duplications of functional genes
What are the coding regions of genes called? - correct answer ✔exons
What are the non coding regions of genes called? - correct answer ✔introns
What is the significance of introns? - correct answer ✔allow eukaryotes to
make protein variants by splicing exons together
Lower eukaryotes are expected to have less of what? - correct answer
✔introns
Genomes, and Chromosomes Question
and answers 100% correct
How does the packaging of bacterial(prokaryote) DNA occur? - correct
answer ✔- negative supercoiling
- genome is organized into separate loops
-located in nucleoid
What is each loop of the supercoiling bound to? - correct answer ✔protein
How many chromosomes per cell do bacteria have? - correct answer ✔one
(with a single copy of each sequence)
nucleoid exists in - correct answer ✔cytosol
How does the packaging of eukaryote DNA occur? - correct answer ✔-
compacted with histones
- in nucleus
Is reassociation a slower process for single copies or repeated sequences of
DNA? - correct answer ✔single copies
eukaryotes have 2
single sequence reassociation occurs - correct answer ✔slowly
multiple copies reassociation occurs - correct answer ✔quickly
, Are A-T or G-C repeats in DNA more dense than average DNA composition?
At are normally how many copies
GC are normally how many copies - correct answer ✔G-C
(A-T is actually less dense)
AT- multiple
GC-1
Satellite sequences are what? - correct answer ✔non-coding regions
What is thought to be the function of satellite DNA? - correct answer
✔Structural support (high concentration near centromeres)
How much of the total genome is composed of satellite DNA? - correct
answer ✔10-20%
What are Alu sequences? - correct answer ✔duplications of functional genes
What are the coding regions of genes called? - correct answer ✔exons
What are the non coding regions of genes called? - correct answer ✔introns
What is the significance of introns? - correct answer ✔allow eukaryotes to
make protein variants by splicing exons together
Lower eukaryotes are expected to have less of what? - correct answer
✔introns
