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guapka [62]
3 years ago
5

Which layer best represents the mantle?A. 1B. 2C.3D.4

Biology
1 answer:
kirill [66]3 years ago
6 0
2 is the best represent
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Compare bacteria to other single-celled organisms. How do they differ? How do they compare to viruses?
Vlada [557]
Bacteria<span> are single-celled, </span>prokaryotic<span> microorganisms that exist in abundance in both living hosts and in all areas of the planet. 

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4 0
3 years ago
The region of a Drosophila embryo with a low concentration of bicoid protein will develop into the _____. a) abdomenb) male flow
joja [24]

Answer:

The correct option is d) head.

Explanation:

Bicoid protein works as a transcription factor. It enters the nuclei of the embryos in early segmentation, where it activates the hunchback gene. In Drosophila, embryonic development begins at the time of fertilization. The sperm enters the mature oocyte through the micropile, a structure located in what will be the anterior region of the egg. Bicoid and hunchback mRNAs, protein products are critical for the formation of the head and thorax. Already in the early stages of oocyte development, certain mRNAs are located in specific regions of the oocyte: mRNA molecules encoding the Bicoid protein are preferentially located in the anterior region of the oocyte. Moderate levels of the bicoid protein are necessary to activate the formation of the thorax (i.e., the expression of the hunchback gene) but the formation of the head requires high concentrations of Bicoid, the promoters of a specific gap gene of the head must have sites of low affinity binding for Bicoid, so that this gene can be activated only in extremely high concentrations of Bicoid.

The lack of Bicoid protein affects the formation of the head and other structures in the anterior region of the oocyte.

6 0
3 years ago
What is the NUTRIENT needed as an energy store and insulation?
Alina [70]

Fat is the nutrient needed as an energy store and insulation.

8 0
3 years ago
Since the Wicked Witch from the Wizard of Oz melted away when she was doused with water, what do you think her cell membranes we
Bad White [126]

Answer:

silicone

Explanation:

cause it melts

5 0
3 years ago
Please answer asap will give branlyist if can
Advocard [28]

Answer:

mitosis

Explanation:

Gametes are produced by mitosis (not meiosis) and after fertilization a diploid zygote is created. The single zygote cell never grows or divides my mitosis. It can only divide by meiosis to produce haploid cells once more, which then produce the main adult body.

8 0
3 years ago
Read 2 more answers
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