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AVprozaik [17]
3 years ago
5

What is the structure of a DNA molecule called?

Biology
1 answer:
Sergeeva-Olga [200]3 years ago
7 0

Answer:

Double Helix

Explanation:

It is called the double helix for the signature shape that a DNA strand takes.

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Evesa
Artist 52 [7]

Answer:

Active uptake (which I think you mean active transport) is important when the concentration gradient is against that of a certain substance, so it doesn't cross the membrane through diffusion or passive transport. It is sometimes necessary if a substance needs to move across a membrane but can't do so due to electrical charge or that there is a substance on the other side of the membrane preventing diffusion.

Explanation:

8 0
3 years ago
The stage which serves as a connecting link between meiosis 1 and meiosis 2 is​
Sholpan [36]

Answer:

between meiosis 1 and meiosis 2 is Anaphase 1.

Explanation:

4 0
3 years ago
Read 2 more answers
Elastic cartilage and most hyaline cartilages are surrounded by a protective sheath called a:.
harkovskaia [24]

Answer:

Perichondrium

Explanation:

Elastic cartilage (like hyaline cartilage) has chondrocytes located in lacunae and the tissue is surrounded by a perichondrium. The perichondrium (Figure 7–2) is a sheath of dense connective tissue that surrounds cartilage in most places, forming an interface between the cartilage and the tissues supported by the cartilage. The perichondrium harbors the blood supply serving the cartilage and a small neural component. Articular cartilage, which covers the ends of bones in movable joints and which erodes in the course of arthritic degeneration, lacks perichondrium.

6 0
2 years ago
Do you think true water-conducting tissue is a derived character of either embryophytes or green algae? Why or why not?
ludmilkaskok [199]

Answer:

i think true water-conducting tissue is a derived character of green algae?

Explanation:

WHY?

Many characteristics of land plants also appear in algae like both are multi cellular, euks, photosynthetic autotrophs so are brown, red, and certain green algae, plants have cell walls made of cellulose and so do green algae

However, charophytes are the only present day algae that share these traits with land plants

1.Rings of cellulose-synthesizing proteins (circular rings of proteins in plasma membrane that make cellulose of cell wall)

2.Structure of flagellated sperm

3.Formation of a phragmoplast ( group of microtubules known as phragmoplast formes b/t daughter nuclei of a dividing cell, giving rise to a cell plate making cross wall that separates the daughter cells)

Comparisons of both nuclear and chloroplast genes point to charophytes as the closest living relatives of land plants

Land plants are not descended from modern charophytes, but share a common ancestor with modern charophytes

WHY NOT?

The origin of embryophytes, as these multicellular plants arose and conquered the land, was a pivotal event in the history of life on earth. Without embryophytes, there would be no animals or humans surviving on the land portion of our planet. The provide food, habitat, energy, oxygen, protection, and numerous vital other functions for the world's creatures. Human beings also benefit from the aesthetic beauty, medicines, and innumerable products derived from these diverse plants.

8 0
2 years ago
Compare and Contrast
enyata [817]
There is a huge difference between<span> bioitic and </span>abiotic<span>. </span>Biotic<span> means living ("bio") and </span>abiotic<span>, as stated by ayl0124, is the opposite, meaning nonliving. </span>Biotic factors<span>are part of the ecosystem. Some of these include plants and bacteria.</span>
7 0
2 years ago
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