3.5 Nucleus Flashcards
Most cells have a nucleus, which cell has no nucleus
Red blood cells
Which cells have multiple nucleus
Skeletal muscle cells
Nuclear Envelope Function
Both layers of the nuclear envelope are lipid bilayers similar to the plasma membrane.
nuclear pores Function
Nuclear pores control the movement of substances between the nucleus and the cytoplasm.
Can Large molecules pass the nuclear pore through simple diffusion?
NOOOOO
Most large molecules, such as RNAs and proteins, cannot pass through the nuclear pores by diffusion. Instead, their passage involves an active transport process
Where are Ribosomes Produced
Hint: It has to do with the Nucleus
Inside the nucleoli are one or more spherical bodies called
What happens to Nucleoli, During cell division
Nucleoli disperse and disappear during cell division and reorganize once new cells are formed.
Within the nucleus are most of the cell’s hereditary units, called
Genes
Human somatic (body) cells have how many chromosomes
46 hense 23 from each parent
What is chromatin
A mixture of DNA and proteins that form the chromosomes found in the cells of humans and other higher organisms
if the DNA template had the base sequence AGCT, what would be the mRNA base sequence, and what enzyme would catalyze DNA transcription?
The mRNA would be UCGA. And the enzyme RNA Polymerase
What happens in translation?
In the process of translation, the nucleotide sequence in an mRNA molecule specifies the amino acid sequence of a protein. Ribosomes in the cytoplasm carry out translation
What roles do the P and A sites serve?
P is the poleypetide chain
A, is the entrees for new codons to match
Distinguishbetweensomaticandreproductivecelldivision and explain the importance of each.
Somatic cell division replaces dead or injured cells and adds new ones during tissue growth.
Reproductive cell division is the mechanism that produces gametes, the cells needed to form the next generation of sexually reproducing organisms. This
Distinguish between somatic and reproductive cell division and explain the importance of each.
Somatic cell division replaces dead or injured cells and adds new ones during tissue growth.
Reproductive cell division is the mechanism that produces gametes, the cells needed to form the next generation of sexually reproducing organisms. This
