Exam 2 Flashcards
The central granule within a nuclear pore complex (NPC) is called
Transporter
The inner nuclear membrane is supported by a
Nuclear Lamina
Nucleoli are composed of which 3 substances?
DNA, RNA, and Proteins
Which type of chromatin is usually under active transcription?
Euchromatin
Histone proteins create bead-like structures of DNA called
Nucleosomes
Which nuclear area is connected to the inside of rough endoplasmic reticulum
Perinuclear space
Which human cells lack a nucleus?
Mature red blood cells
Name of proteins that transport materials into the cell’s nucleus
Importins
Where does an individual’s mitochondrial DNA come from? Haploid or diploid?
Mother, haploid
3 functions of nucleoli
make rRNA, proteins, and daughter nucleoli
4 parts of eukaryotic chromosomes
DNA strand, proteins, centromere, and telomeres
What is a telomere
Repeating sequence at each end of chromosome
Name two purines
Adenine and Guanine
Name three pyrimidines
Cytosine, Thymine, and Uracil
How do base pairs bond and how many H bonds
A to T or U with 2 H bonds, G to C with 3 H bonds
Why is DNA held together with weak H bonds?
Need to be “unzipped” for transcription
Name 3 parts of DNA and kind of pentose sugar
One phosphate group, one pentose sugar (deoxyribose), and nitrogenous base pairs
Name 3 parts of RNA and kind of pentose sugar
One phosphate group, one pentose sugar (ribose), and nitrogenous base pairs
What is name of single strand of RNA when loops together?
tRNA
How does the structure of DNA nucleotides differ than RNA nucleotides?
the pentose sugar and Uracil instead of thymine
How are the double helix strands held together?
H bonds
How do the bases pair up in DNA
A-T and C-G
How many H bonds between A and T
2
How many H bonds between C and G
3
