Chapter 6.3 Flashcards
Which organelle houses most of the DNA in eukaryotic cells?
nucleus
It refers to the double membrane enclosing the nucleus.
nuclear envelope
TRUE or FALSE:
The membranes of the nucleus are separated by 20 to 40 nm, but at the lip of each nuclear pore, the inner and outer membranes are continuous.
True
Which intricate protein structure lining the nuclear pores is regulating the entry and exit of proteins and RNAs?
pore complex
It refers to the netlike array of protein filaments (intermediate filaments) lining the inner nuclear membrane which mechanically supports the nuclear envelope.
nuclear lamina
It refers to the framework of protein fibers extending throughout the nuclear interior.
nuclear matrix
TRUE or FALSE:
Each chromosome contains one long DNA molecule associated with proteins, including small basic proteins called histones.
True
It refers to the complex of DNA and proteins making up the chromosomes.
chromatin
Which organelle synthesizes ribosomal RNA?
nucleolus
TRUE or FALSE:
Inside the nucleolus, the proteins imported from the cytoplasm are assembled with rRNA into large and small subunits of ribosomes.
True
TRUE or FALSE:
The number of nucleoli in the nucleus depends on the species and the stage in the cell’s reproductive cycle.
True
Which organelle carries out protein synthesis?
ribosome
TRUE or FALSE:
Cells with high rates of protein synthesis have large numbers of ribosomes and prominent nucleoli.
True
TRUE or FALSE:
Bound and free ribosomes are structurally identical, and ribosomes can play either role at different times.
True
TRUE or FALSE:
Cells that specialize in protein secretion have high proportions of bound ribosomes.
True
