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Helga [31]
3 years ago
8

Epithelial tissues always exhibit polarity; that is, they have a free surface and a basal surface. Epithelial tissues always exh

ibit polarity; that is, they have a free surface and a basal surface. True False
Biology
1 answer:
svet-max [94.6K]3 years ago
4 0

Answer:

True. They always exhibit polarity.

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NEED HELP ASAP!! Which arrows on the diagram below represents differentiation of cells? THANKS!!
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At the molecular level, gene duplication often produces novelty in a lineage. This process provides another evolutionary pathway
alukav5142 [94]

Answer:

Bridgham et al. (2006) showed that the interaction between a steroid hormone (aldosterone-M) and its receptor (mineralocorticoid) evolved by Darwinian gradualism. In this work, the authors demonstrated  a primitive affinity between the hormone and its receptor that was initially present in chemically similar but more ancient ligands. This result has implications in understanding the association between gene duplication and the evolution of hormone signaling pathways. For example, in invertebrates, this work reinforces the importance of gene duplication in the existing interaction between paralogous glucocorticoid receptors and their receptor mineralocorticoid genes that were derived from duplication (Thornton 2001).

The publications above cited are the following:

J.T. Bridgham, S.M. Carroll, and J.W. Thornton (2006). Evolution of hormone-receptor complexity by molecular exploitation. Science, 312(5770), 97-101.

JW Thornton. Evolution of vertebrate steroid receptors from an ancestral estrogen receptor by ligand exploitation and serial genome expansions, Proc Natl Acad Sci USA (PNAS), 2001, vol. 98 10 (pg. 5671-5676).

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What is converting the genetic code into the language of proteins?
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This is a process called transcription and translation.

Information to synthesize a particular protein is found in DNA in the cell nucleus. This information is copied (transcribed)  onto messenger RNA or mRNA in short. The copying process is called transcription.

mRNA then leaves the nucleus and enters the cytoplasm where it attaches to a ribosome. Transfer RNA or tRNA then begins to read (translate) the information on the attached mRNA. This is the process of translation.

tRNA then fetches amino acids that correspond to this information and brings them to the ribosome where they are linked together into a chain. This chain of amino acids is the primary structure of  the protein.

7 0
3 years ago
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