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EleoNora [17]
3 years ago
12

During autumn, the leaves of the plants turn red and fall, resulting in complete defoliation of the trees. Which mechanism is ta

king place?
Dormancy



Senescence



Photoperiodism
Biology
1 answer:
lina2011 [118]3 years ago
8 0

A.....................................

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Neporo4naja [7]

Explanation:

1. cell membranes are partialy permeable, only allowing passage to some certain molecules.

2. diffusion is the movement of molecules across partially permeable membrane down concentration gradient.

3. the molecules are too big to pass through partially permeable membrane. the concentration of the molecule might be higher in the cell than in the solution/surroundings.

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3 years ago
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g100num [7]
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3 years ago
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Which mutations is most likely to cause a phenotypic change?
melomori [17]

The question is incomplete. The complete question is as follows:

Which of the following mutations is most likely to cause a phenotypic change?

A) a duplication of all or most introns

B) a large inversion whose ends are each in intergenic regions

C) a nucleotide substitution in an exon coding for a transmembrane domain

D) a single nucleotide deletion in an exon coding for an active site

E) a frameshift mutation one codon away from the 3' end of the nontemplate strand

Answer: D) a single nucleotide deletion in an exon coding for an active site

Explanation:

Deletion or insertion of a single nucleotide in an axon coding for an active site is called frameshift mutation.

The sequence of codons is read during translation, in order to synthesize a amino acids chain and form a protein from the nucleotide sequence. Frameshift mutations occur when the usual codon sequence is broken by the deletion or addition of one or more nucleotides. For example, if only one nucleotide is removed from the axon sequence during the RNA splicing process, then there will be a disrupted reading frame for all codons before and after the mutation. This may result in several incorrect amino acids being introduced into the protein. Disruption in protein sequence will cause phenotypic change.

Hence, the correct option is D) a single nucleotide deletion in an exon coding for an active site .

5 0
3 years ago
Label the cell membrane
Daniel [21]

Answer:

a and b

Explanation:

i don't know ok

but is true

6 0
2 years ago
Which of the following is an example
lisabon 2012 [21]

Answer:

B

Explanation:

soil being depleted to nitrogen due to high runoff

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