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bonufazy [111]
3 years ago
15

What did Watson and Crick’s model of DNA show?

Biology
2 answers:
taurus [48]3 years ago
6 0
The double-helix shape of DNA.
Nesterboy [21]3 years ago
4 0

Answer:

In 1953, Watson and Crick determined the double-helix composition of DNA, that is, the molecule comprising human genes. They found that the composition of DNA was a spiral of two strands of DNA or a double-helix polymer, each comprising a lengthened monomer chain, that is, the nucleotides wrapped around each other.  

The DNA, that is, a nucleic acid formed of nucleotides combined into chains or long strands with the help of covalent bonds. The nitrogenous bases present in the DNA are guanine, adenine, thymine, and cytosine.  

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Answer:

E) In both mosses and ferns, moisture is required for sperm to reach the egg. In mosses, gametophyte is the dominant stage of the life cycle. In ferns, the sporophyte is the dominant stage of the life cycle.

Explanation:

The *sporophyte of fern plant is dominant over the smaller and nutritionally independent gametophyte*. The sporophytes are photosynthetic, long-lived and highly branched. *Sperm cells of fern possess whip-like flagella in their cell walls that enable moisture swim to reach the egg*

*In Mosses,the gametophyte is more prominent (dominant)* just like in lower plants. These organisms *require external water(moisture) in the form of dew or rain to move their sperm during fertilization*.

Therefore, *In ferns, the sporophyte is dominant over the gametophyte*, while *in mosses,gamatophyte is dominant over the sporophyte.* Both require moisture for sperm to reach egg.

5 0
3 years ago
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8 0
2 years ago
An object has a mass of 8.00 kg. what is the force due to gravity in the object
givi [52]

Answer:

Explanation:

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