The answer is, A. Monophyletic.
In plants photosynthesis<span> takes place in chloroplasts. Chloroplasts may be in the cells of fruits, stems, but most of all in leaves. In some succulents (such as </span>cacti<span>), the main </span>photosynthetic<span> activity is associated with a stem.</span>
Answer:
Hydrogen bonding.
Explanation:
Hydrogen bonding is basically the force which holds the molecules of water together. It is an extremely strong force and is responsible for higher boiling point of water. Hydrogen bonding occurs due to electronegativity difference between Oxygen and Hydrogen atoms. Hydrogen atom develops partial negative charge while Oxygen develops partial positive charge. Therefore, Oxygen atom of one molecule attracts the hydrogen of other molecule and this goes one. This way extremely strong bonding develops that holds water molecules together.
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The given question is incomplete. The complete question is as follows:
A protein has the amino acid sequence:
Asp-Ser-Arg-Leu-Ser-Lys-Thr-Met-Tyr-Ser-Ile-Glu-Ala-Pro-Ala-Lys-Leu-Asp-Trp-Glu-Gln-Asn-Met-Ala-Leu
How many peptide fragments would result from cleaving the sequence with…
a)cyanogen bromide=_______
b)trypsin=________
c) chymotrypsin=________
Answer:
Different enzymes and chemical conditions are require to hydrolyze the proteins into small peptides and amino acid sequences.
a) The cyanogen bromide can cut only at C terminus end of the methionine residues. The cynogen bromide will cleave at Thr-Met-Tyr and Asn-Met-Ala-. This results in the generation of three fragments.
b) Trypsin enzyme cleaves the lysine and arginine residue of the peptide chain and should not be followed by proline. Lysine will cleave at Ser-Lys-Thr, Ser-Arg-Leu, and Ala-Lys-Leu. This result in the generation of four fragments.
c) Chymotrypsin cleaves at the carboxy side of aromatic amino acid residues ( phenylalanine, tyrosine, tryptophan) and leucine. This will cut at the Arg-Leu-Ser, Met-Tyr-Ser, Lys-Leu and Asp-Trp-Glu and results in the generation of five fragments.
Answer:
D. Antenna pigments allow more wavelengths of light and more photons to be captured, increasing the efficiency of light capture.
Explanation:
The photosynthetic pigments can be part of the antenna pigments or part of the reaction center. The role of the antenna pigments (large number of protein-bound pigment molecules) is to absorb photons and transfer their energy to the reaction center. Simply saying, antenna pigments are light-harvesting complexes. They are composed of polypeptides, that bind chlorophyll a, chlorophyll b, carotene and xanthophylls.