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ycow [4]
3 years ago
12

23. What biological term is best used to explain the color of leaves changing with the decreased in ambient UV light as seasons

change? a. Photo-periodism c. Growth hibernation b. Evanescence d. Photo-liberation
Biology
1 answer:
GarryVolchara [31]3 years ago
5 0

Answer: a. Photo-periodism

Explanation:

The relative length of the day is considered as a major factor in the development of plants, particularly in sexual reproduction. The plants were grouped considering that the flowering and fruiting occurs only when the length of the day is within certain limits so that these phases are achieved only in certain times of the year. Therefore, some species respond to long days, while others respond to short days, and still, others are capable of responding to all day lengths. The name and meaning of each group became as follows:

Short Day Plants: They are the species that bloom in smaller photoperiods than a critical maximum.

Long day plants. These are the species that bloom in larger photoperiods than a critical minimum.

Neutral day plants: They are those that bloom in a wide range of the photoperiod.

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4 0
2 years ago
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Based on the definitions of pharmacophore and privileged structure, outline essential structural features a 1,4-dihyrdopyridine
stiv31 [10]

Answer:

Explanation:

Pharmacophore (pharmacology) - The molecular framework responsible for a drug's biological activity. According to IUPAC — A pharmacophore is the ensemble of steric and electronic features that is necessary to ensure the optimal supramolecular interactions with a specific biological target structure and to trigger (or to block) its biological response.

Privileged structures are defined as molecular frameworks which are able of providing useful ligands for more than one type of receptor or enzyme target by judicious structural modifications.

1) The 1,4-dihydropyridine ring is present in many biologically important molecules that acts as an important scaffold for cardiovascular drug - a calcium antagonists and although it is technically not considered as a pharmacophore, it is considered as a privileged structure.

1,4-Dihydropyridine (DHP), belongs to the class of calcium antagonist that inhibits the influx of extracellular Ca+2 through the L-type voltage-dependent calcium channels.

A positional substitution in the 4-position is feasible in the heterocyclic ring which in turn culminates in various calcium channel antagonist activities and this heterocyclic ring is the common feature for various pharmacological activities such as anti-inflammatory activity, analgesic activity,

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Position on the heterocyclic ring binds to the L-type channel and also to N-type channel on membranes.

2.) The bioisosteres are not a suitable bioisostere for the traditional C-4 aryl or heteroaryl substitution which is necessary for calcium ion blockage thereby inhibiting it to function with the mechanism shared above.

6 0
3 years ago
<img src="https://tex.z-dn.net/?f=%7B%5Chuge%7B%5Cunderbrace%7B%5Coverbrace%7B%5Ccolor%7Baqua%7D%7BQuestion%7D%7D%7D%7D%7D" id="
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Yes, you can structures it within roots

Explanation:

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2 years ago
Which cell organelle is necessary for cellular digestion?
aleksandr82 [10.1K]
I think it might be lyosomes as they help break down waste and other stuff in a cell.
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3 years ago
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Answer:

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Explanation:

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