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drek231 [11]
3 years ago
10

In addition to sunlight, what two substances are required for the start of photosynthesis?

Biology
2 answers:
algol133 years ago
5 0
You need water and oxygen to start photosynthesis
ira [324]3 years ago
4 0

You need water and oxygen

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Which of the following was NOT a motivation for the creation of ASEAN?
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<span>ASEAN is an Association of Southeast Asian Nations - a multination association that has as its aim an economic cooperation between Southeast Asian countries (such as Thailand). This association did not arise as a response to external factors, so any reason connected to externam factors would not apply - such as the reliance on some external powers (such as the US). It is focused on the cooperation between the members only - not an external association.</span>
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Other than enzymes, what else can be used to separate the DNA strands?
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The enzyme responsible for separating the two strands of DNA in a helix so that they can be copied during DNA replication.Explanation:

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2 years ago
Blood pumps through arteries due to contraction of the arterial walls but flows more freely through veins because there is littl
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Excitable cells like those found in muscle tissue are expected to be present in higher quantities in arteries than in veins.

<h3>What are Excitable cells?</h3>

Excitable cells are defined as those cells that are capable of generating electrical impulses when stimulated. Example of such cells include:

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The artery is made up of higher amount of smooth muscles than the veins therefore, excitable cells like those found in muscle tissue are expected to be present in higher quantities in arteries than in veins.

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Sister chromatids of a pair of homologous chromosomes form tetrads, and crossing-over (exchange of genetic information between r
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Crossing over (exchange of genetic information between regions of non-sister chromatids in the tetrad) occurs in the prophase I stage of meiosis.

<h3>WHAT IS MEIOSIS?</h3>

Meiosis is the process whereby a single cell produces four daughter cells that are genetically different from one another.

Meiosis is able to ensure genetic diversity in the daughter cells due to a process called Crossing over.

Crossing over is the exchange of genetic material between the non-sister chromatids of homologous chromosomes. It occurs in the prophase I stage of meiosis.

Therefore, crossing over (exchange of genetic information between regions of non-sister chromatids in the tetrad) occurs in the prophase I stage of meiosis.

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