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Nitella [24]
3 years ago
9

After a polypeptide chain has been synthesized, certain amino acids in the peptide may become modified. For each modified amino

acid, identify the standard amino acid from which it is derived. Enter the abbreviated name of the standard amino acid.
Biology
1 answer:
Olenka [21]3 years ago
8 0

Answer:standard amino acids is an amino acid used in the synthesis of peptides

Explanation: There are twenty standard amino acids which are

ALA, ARG, ASN, ASP, CYS, GLN,GLU,GLY,

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Double posting doesn't really help to get responses. Its the same as before

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4 0
3 years ago
How Light Bleaches Rhodopsin
OleMash [197]

Answer:

Salut!

  1. Light enters the eye through the cornea.
  2. Light travels to the macula within the retina.
  3. Rhodopsin absorbs light, and the Vitamin A changes shape.
  4. Vitamin A detaches from the rhodopsin, and some vitamin A is lost.
  5. Vitamin A from the bloodstream replenishes what is lost. The vitamin A returns to its original shape.

Explanation:

Retina is the part of the eye that contains photosensitive cells that capture light and produce the electrical signals that the brain perceives as images. These photosensitive cells are of two kinds:

  • Rods
  • Cones

Rods contain the photosensitive pigment, rhodopsin that is needed for vision at night or in dim light. Cones function in bright light.

Rhodopsin Bleaching:

Vision in bright or excessive light requires a process called rhodopsin bleaching which is the degradation of rhodopsin upon exposure to light. Upon contact with light, rhodopsin goes through structural changes characterized by the conversion of a pigment derived from Vitamin A, 11-<em>cis</em> retinal to all <em>trans</em> retinal. This chemical conversion initiates a photo-transduction reaction (reaction in which a photon of light is converted into electrical signals) that produces the electrical signals that travel to the brain via the optic nerve. The brain converts the electrical signals to images. This is followed by rhodopsin regeneration in the dark in which all <em>trans</em> retinal is converted back into 11 <em>cis</em> retinal.

3 0
3 years ago
Which substances are responsible for accelerating chemical reactions in cells? amino acids enzymes nucleic acids lipids
Liono4ka [1.6K]
Enzymes are biological catalysts that speed up reactions
3 0
3 years ago
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Answer:

Earth, Mars

Explanation:

Earth is the only planet on which life is known to exist. Water on earth exists in all three forms

Presence of water on Mars was recently confirmed. Though liquid water is no more present, in solid form, water is present in polar ice caps.

7 0
3 years ago
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What are pteridophytes?​
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Answer:

A pteridophyte is a vascular plant that disperses spores. Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as "cryptogams", meaning that their means of reproduction is hidden. Ferns, horsetails, and lycophytes are all pteridophytes.

Explanation:

5 0
2 years ago
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