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3 years ago

When a nerve cell is stimulated, the cell membrane becomes permeable to _?

Biology

2 answers:

mel-nik [20]3 years ago

7 0

Hey You!

I believe these are the answers:

Blank 1 = More.

Blank 2 =Sodium.

(Quite sure these are correct).

Sveta_85 [38]3 years ago

6 0

Answer:

When a nerve cell is stimulated, the cell membrane becomes MORE permeable to Na+.

Explanation:

When the action potential is fired, opening of Na+ ion channels in membrane makes it more permeable to the Na+ ions. The Na+ ions enter the axon and makes the inside of the membrane more positive. This is called as depolarization. Depolarization of axon is followed by depolarization during which K+ ion channels are opening to allow movement of K+ ion outside the axon and to make the inner side of axon membrane negative again.

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3 years ago

Comparing DNA Replication and Transcription

ozzi

The missing information has been completed as:

DNA Tempelate complementary DNA mRNA

3' TTACG 5' 5' AATGC 3' 5'UUACG 3'

3' AAUGC 5' 5' TTACG 3' 5'UUACG 3'

3' GGCGG 5' 5' CCGCC3' 5' CCGCC3'

' 3'TGCATCG5' 5' ACGTAGC 3' 5' ACGUAGC 3'

3' AGACTC 5' 5' TCTGAG 3' 5' AGACTC 3'

3'GATAAGA 5' 5' CTATTCT 5' 5' CTAUUCA 3'

3' CTGGCTAC5' 5' GACCGATG 3' 3'CUGGCUAC 5'

Explanation:

Some of the sequence of DNA given is in 3' to 5' direction, mRNA sequence is also given.

The DNA is double stranded helix which replicates by semi conservative mode. The two strands unwind to act as a template for other strands. In transcription the 3' to 5' strand acts as a template because RNA synthesis takes place in 5' to 3' direction. mRNA is single strand. It has nucleotides in it from which 3 base pairs acts as a code for amino acid.

The following table shows DNA strand having complementary sequaence and mRNA synthesized.

DNA Tempelate complementary DNA mRNA

3' TTACG 5' 5' AATGC 3' 5'UUACG 3'

3' AAUGC 5' 5' TTACG 3' 5'UUACG 3'

3' GGCGG 5' 5' CCGCC3' 5' CCGCC3'

' 3'TGCATCG5' 5' ACGTAGC 3' 5' ACGUAGC 3'

3' AGACTC 5' 5' TCTGAG 3' 5' AGACTC 3'

3'GATAAGA 5' 5' CTATTCT 5' 5' CTAUUCA 3'

3' CTGGCTAC5' 5' GACCGATG 3' 3'CUGGCUAC 5'

3 0

3 years ago

When a nerve cell is stimulated, the cell membrane becomes ______ permeable to _______?

When a nerve cell is stimulated, the cell membrane becomes permeable to _?