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LiRa [457]
3 years ago
6

Why do most angiosperms have alternate phyllotaxy, with leaf emergence at an angle of 137.5° compared to leaves above and below?

Biology
1 answer:
Elanso [62]3 years ago
4 0

Answer: The answer is D: to allow maximum exposure to light and to reduce shading of lower leaves.

Explanation:

The arrangement of leaves on a Stem is known as Phyllotaxy. It is used to enable them obtain maximum exposure to sunlight.

Leaves are classified as either alternate, spiral or opposite.

Leaves with alternate pattern arise at a different point (node) on the stem. This helps reduce shading of the lower leaves.

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Which of the following events occurred during the first trimester?
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I believe that the answer to your question would be A. Heart Begins.
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Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?
kolezko [41]

Ans.

Diffusion, osmosis, and active transport are mechanism of cellular transport that involves movement of molecules through plasma membrane. Diffusion shows movement of small, hydrophobic particles without the help of protein molecules through cell membrane along the concentration gradient.

Osmosis involves movement of water molecules against concentration gradient (from an area of high solvent concentration to an area of low solvent concentration) through cell membrane.

Active transport shows movement of particles, against the concentration gradient, means from a region of higher to lower concentration of molecules through cell membrane. It involves transport through membrane proteins.

Thus, the part of cell, which is affected by the movement of molecules through osmosis, diffusion, and active transport is cell membrane or plasma membrane.

7 0
3 years ago
Landslides occur when earth materials that are no longer held by friction move down a slope with the help of gravity. I think th
xxTIMURxx [149]

Yes, the given statement is true.  

A landslide is illustrated as the movement of debris, the mass of rock, or earth down a slope. The landslides are a kind of mass wasting that signifies any down-slope movement of rock and soil under the direct effect of gravity.  

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8 0
3 years ago
If adenine didn’t always pair with thymine and guanine didn’t always pair with cytosine, the new DNA ladders wouldn’t always be
zloy xaker [14]

Answer:

they wouldnt be identical because for example Guanine could be paired with thymine in the original DNA strand but could decide to pair with adenine in the replication DNA. that would make a different type of DNA.

Explanation:

DNA replication is a beautiful process. In DNA replication adenine only pairs with thymine and guanine only pairs with cytosine. this ensures that a replication of the DNA will be the same type of DNA.

Replication works like this. Helicase splits open the DNA and each side is copied by DNA polymerase. If let's say the nucleotide bases for side 1 are ATGCGA then the DNA polymerase will pair these with the matching bases TACGCT which will make the same DNA but if each base could pair with any base they want that could create a few different variations of the original DNA. ATGCGA could very well be paired with TCGACA or CGACTA which would created two different types of DNA.

3 0
3 years ago
Why will salivary amylase not break down protein
Free_Kalibri [48]
Salivary amylase is an enzyme that is found in saliva in the mouth. It is an enzyme that only recognizes the glycosidic bonds between molecules of simple sugars that form the carbohydrate polymers. It specifically targets these bonds and breaks them and does not recognize any other bonds of different substances such as protein. Salivary amylase is alkaline in nature and cannot work in the stomach. It breaks the glycosidic bonds between the glucose molecules in starch to form maltose. Maltose is later broken down further by pancreatic amylase, into individual units of glucose.
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