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saw5 [17]
3 years ago
5

The two major cell types in a sponge's tissues are

Biology
1 answer:
Delvig [45]3 years ago
3 0

Answer: B. collar cells and amoebocytes

The collar cells have a funnel like collar and a flagellum. Collar cells whip their flagella to make water go through the sponge. Then the water brings nutrients and oxygen, while while also taking out waste and carbon dioxide.

Amoebocytes first deliver nutrients from choanocytes to the other cells, giving rise to eggs. Then they bring phagocytized sperm from choanocytes to eggs.

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Choose the correct sequence of the prokaryotic operon. A) gene, operator, promoter B) promoter, operator, gene C) operator, prom
Harrizon [31]

Answer:

The correct answer is option B, that is, promoter, operator, gene.

Explanation:

In a prokaryote, just in front of the operator, the promoter is located, and just in front of the structural genes, the operator is located. All these in combination give rise to an operon.  

Any gene, which codes for an enzyme or a structural protein is termed as a structural gene, in the lac operon, a structural gene codes for three distinct kinds of enzymes. A short sequence of DNA is situated just in front of the structural gene, which is known as the operator. An operator functions as a switch for transcription, that is, it monitors whether the process of transcription will take place or not.  

Just in front of an operator, a sequence of a promoter is present, and for the transcription and translation of all the structural genes, the RNA polymerase needs to combine first with the promoter. In case, if no transcription is to take place, then the operator allows the repressor to bind with it and prevent the attachment of RNA polymerase with the promoter. Hence, the correct sequence of a prokaryotic operon is a promoter, operator, and gene.  

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2 years ago
Describe homeostasis and give one example of your body trying to maintain homeostasis
mezya [45]

Answer:

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Explanation:

7 0
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Fertilization takes place when (2 points)
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the sperm enters the egg

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nataly862011 [7]
It dies off like a squished bug
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PLEASE HELPP WILL GIVE 30 points!!!!!!!!
dezoksy [38]

Answer:

1. eukaryotic 2. interphase 3. proteins 4. cancer   <em>For the blanks by order top to down.</em>

<em></em>

Explanation:

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