BIOL 1090 Study Guide - Ribosomal Rna, 18S Ribosomal Rna, 5.8S Ribosomal Rna

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27 Apr 2012

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Nuclear membrane, nuclear pores, nuclear lamina: structure two parallel phospholipid bi-layers separated by 10-50nm, different than other membranes we"ve discussed. Outer membrane binds ribosomes: continuous with rough er intermembrane space continuous with er lumen inner membrane bears integral proteins, which connect to nuclear lamina supported by nuclear lamina. Very solid structure; hard to disrupt; cells can rupture and ne will remain intact: function, separates nuclear content from cytoplasm. Segregates transcription and translation: selective barrier. Allows limited movement of molecules between nucleus and cytoplasm using channel proteins. The nuclear lamina: structure thin meshwork of filamentous proteins next to the nucleoplasmic leaflet of the inner nuclear membrane lamins (class v ifs) Bound to inner membrane of ne by integral membrane proteins. Provides structural support for ne associates with dna; provides attachment sites for chromatin: creates specialized regions of activity, allowing relevant parts of dna to be accessed by transcription machinery . Gateways between cytoplasm and nucleoplasm: allow transport.

Related Questions

Choose Among (and **explain why** when appropriate): (1)Nucleus, (2) RNA Polymerase, (3) Cytoplasm, (4) DNA, (5) Enzyme ,(6) Plasma Membrane, (7) Lysosome

-the molecular source of information for transcription?
-the main enzyme for making a polymer of RNA?
-location of transcription in a eukaryotic cell?
-location of transcription in a prokaryotic cell?
-location of translation in a eukaryotic cell?
-location of translation in a prokaryotic cell?

Select ALL of the true statements about protein targeting.

Nucleotides interact with a nuclear import receptor for transport into the nucleus for the process of DNA replication and transcription.

Signal sequences that direct proteins to the correct compartment are added to proteins through post-translational modification.

The SRP receptor functions to maintain the position of the ribosome on the ER membrane during the process of protein sorting to the ER.

Introduction of non-hydrolyzable GTP into a cell would cause an accumulation of importin receptors inside the nucleus.

all of the above are true

none of the above are true

skymanatee186

What step in DNA replication precedes the pairing of complementary bases?

	A.	polymerization of DNA.
	B.	formation of the histone core.
	C.	mitotic division.
	D.	separation of the two strands.
	E.	joining of the two strands.

In eukaryotes, transcription occurs in the

	A.	ribosome.
	B.	mitochondria.
	C.	cell membrane.
	D.	cytoplasm.
	E.	nucleus.

Normal human body cells contain how many chromosomes?

	A.	46
	B.	22
	C.	23
	D.	44
	E.	42

Hershey and Chase performed an experiment in which they used radioactive isotopes to phosphorus and sulfur to label different components of bacterial viruses. Their results clearly showed that

	A.	the viruses did not contain protein.
	B.	genetic material normally contains radioactive isotopes.
	C.	the viruses did not contain DNA.
	D.	protein was entering into the infected bacteria.
	E.	DNA was entering into the infected bacteria.

A package of histones with DNA wrapped around them forms spherical structures called

	A.	nucleosomes.
	B.	lysosomes.
	C.	ribosomes.
	D.	nucleoli.
	E.	chromatin.

DNA replication

	A.	does not require proteins.
	B.	is constantly happening in a cell.
	C.	occurs in G1 of interphase.
	D.	takes place in the nucleus of the cell.
	E.	occurs in the cytoplasm of the cell.

The two subunits of the ribosome join during

	A.	promotion of transcription.
	B.	initiation of translation.
	C.	termination of transcription.
	D.	termination of translation.
	E.	elongation.

DNA replication of a single DNA molecule is referred to as semiconservative because

	A.	each of the two DNA molecules will consist of one parental strand and one newly synthesized strand.
	B.	all the DNA strands in the two DNA molecules will have both parental and newly synthesized DNA.
	C.	it results in two nonidentical DNA molecules.
	D.	of the two DNA molecules, one is made up totally of parental DNA, while the other is entirely newly synthesized DNA.
	E.	one DNA strand is replicated continuously, while the other must be replicated discontinuously.

The bases are bonded to what part of the backbone of the DNA molecule?

	A.	the 4â carbon atom of the sugar molecule.
	B.	the 3â carbon atom of the sugar molecule.
	C.	the 5â carbon atom of the sugar molecule.
	D.	the 1â carbon atom of the sugar molecule.
	E.	the 2â carbon atom of the sugar molecule.

BIOL 1090 Study Guide - Ribosomal Rna, 18S Ribosomal Rna, 5.8S Ribosomal Rna

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