The Nucleus + DNA Packing Flashcards
The nuclear envelope consists of the following:
A double unit membrane
Perinucleur space
Which of the following statements is true?
Eukaryotic cells have a nucleus
What are the benefits of having a separate, membrane bound nucleus?
Enabled the evolution of SPLIT genes + alternative splicing
Rapid response to external environment
Separation of delicate DNA from cystoskeletal filaments
The nucleus may have evolved from membrane INVAGINATIONS which can be seen in modern bacteria. True or false?
True
What does DNA stand for?
deoxyribonucleic acid (DNA)
Name the process these molecules go through:
DNA, mRNA, Protein
replication, transcription, translation
What are the regulatory regions of genes known as?
Promoter / enhancer
What is true about prokaryotic GENES?
Prokaryotic genes are simultaneously transcribed + translated.
Prokaryotic genes are SPLIT into coding exons and NON- coding introns.
How many chromosomes do we have?
46
Humans have 2 sex chromosomes. What are these called?
X chromosome and Y chromosome
XX = female. XY = male.
What are our remaining chromosomes called?
autosomal chromosomes
What are the two arms of a chromosome called?
Short = P arm Long = Q arm
When is highest level of DNA packaging achieved?
Mitosis
DNA and associated proteins in nucleus form a material known as Chromatin.
True or false?
TRUE
What does this picture show?
Beads on a string
Nucleosomes