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3 years ago

What is responsible for the yellow-orange coloration of leaves in the fall?

Biology

1 answer:

mixer [17]3 years ago

7 0

The correct answer is - C) carotenoids.

The majority of the trees from the mid-latitude forests tend to shade their leaves in the autumn. This process occurs because of the seasonal changes in the climate, where the trees tend to be almost not-active during the winter, so in order to preserve as much energy and nutrients as possible they get read off their leaves.

It is not a sudden process, but it takes some time, where the leaves from the initial green color start to change to yellowish, than towards orange, reddish, or brownish before they fall.

The reason why this coloration appears in the leaves when the tree starts to process of shading them off are carotenoids. The carotenoids found in the leaves, the lutein and the beta-caroten, thorugh the xantophills and the flavonoids give a yellowish color to the leaves, thus we get the beautiful autumn colors and landscapes.

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1.6 (IB 2017/MAY – SL P1/5C) When during the cell cycle does DNA replication take place?

Evgesh-ka [11]

Answer:

Mitosis!!!!!!!!!!!!!!

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3 years ago

Which of the following is not common to both prokaryotic and eukaryotic cell division?

julsineya [31]

The correct answer is: A checkpoint will be activated if the spindle does not attach to a kinetochore.

Prokaryotes, do not undergo mitosis (like eukaryotes) and therefore have no need for a mitotic spindle. Prokaryotes also don’ t have checkpoints foor the regulation of cell division.

Normal eukaryotic cells (unlike cancer cells), move through the cell cycle in a regulated way in order to make sure that cells don't divide under conditions that are unfavorable for them. Information about their own internal state (nutrients, signal molecules, DNA integrity) is signal to go or not to go through the cell division. Because of that there are few checkpoints in the cell cycle at which the cell examines the signals and makes a “decision”. The major checkpoints are:

• The G1- the first point at which it must choose, once it passes the G1 checkpoint the cell enters S phase

• The G2-the cell checks DNA integrity and checks if replication is done well.

• The spindle checkpoint-at the transition from metaphase to anaphase.

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3 years ago

Read 2 more answers

What is the study of biological inheritance of traits?

ivann1987 [24]

genetics
this is camellia btw :0

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3 years ago

How to solve these questions

malfutka [58]

Answer:

(i) An allele is a variant of a gene, can either be short or tall.

Dominant = the tall allele that "trumps" the short allele. if a dominant and recessive allele is present (heterozygous) then the dominant phenotype will be shown.

(ii) David's eyes are Brown

(iii) Sarah's eyes are blue

(iv) David - B, b

Sarah - b, b

(v) Possible genotypes include Bb and bb. These give the phenotypes of brown eyes or blue eyes.

(vi) The chance for blue eyes is 50% (or 1:1 ratio)

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3 years ago

Which feature do gas giants have that terrestrial planets do not?

adoni [48]

In our solar system, gas giants are much bigger than terrestrial planets, and they have thick atmospheres full of hydrogen and helium. On Jupiter and Saturn, hydrogen and helium make up most of the planet, while on Uranus and Neptune, the elements make up just the outer envelope.

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3 years ago