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3 years ago

Which describes a difference between the dermis and epidermis?

1 answer:

monitta3 years ago

6 0

The epidermis is the outermost layer of skin and is app. .005-1.5mm thick. it is made up of several different types of cells with keratinocutes being the most abundant.

The dermis is the second layer of skin and is app. .3-3.0mm thick. And basically consists of connective tissue.

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The earths plates move over millions of years bringing continents and other features of the earth to their present arrangements

xxTIMURxx [149]

Alright my friend the best option to go with will be option C. plate tectonics

4 0

3 years ago

Compare and contrast prophase of mitosis and prophase of meiosis1?

Crazy boy [7]

Answer:

The homologous chromosomes pair together in prophase 1 of meiosis, but they do not during prophase 1 of mitosis. This is achieved by a process known as synapsis, where the similar chromosomes pair according to sequence similarity. The homologous chromosomes are held together by a protein structure known as the synaptonemal complex in a chromosome body known as a tetrad (because it contains 4 replicated chromosomes known as chromatids) or bivalent (if the organism is diploid). This pairing during prophase 1 of meiosis allows recombination to take place between the homologous chromosomes. This occurs early during prophase but the manifestation of recombination only becomes visible during the later stages of prophase 1 and in metaphase 1. Because the chromosomes adopt different structures during prophase 1 of meiosis, this stage is sub-divided into 5 stages: leptotene, zygotene, packytene, diplotene and diakinesis. It is during diplotene and diakinesis that the physical manifestation of recombination can be seen. This is the presence of chiasmata (chiasma, singular). These are the sites where recombination, or exchanges between homologous chromosomes, has taken place. By the end of prophase 1, it is only the chiasmata that holds the homologous chromosomes together. This constriction make the tetrads adopt a variety of structures, the shape of which depends upon the number of chiasmata formed. The tetrads stay in this conformation until metaphase 1. Synapsis, the formation of the synaptonemal complex, the formation of chiasmata does not take place during prophase 1 of mitosis and these processes represent the major differences between prophase of the two nuclear divisions.

3 0

3 years ago

The human genome comprises just over 3.1 billion base pairs. Assuming average nucleosome spacing throughout the genome, how many

Ymorist [56]

Answer:

Option C, 32 million

Explanation:

As per standard rule -

Number of base pair per nucleosome is equal to $200$

Now, the total number of base pair in human genome is $3.1$ billion.

Number of nucleosome in $3.1$ billion base pairs is equal to

$\frac{3.1* 10^9}{200} \\= 1.55 * 10^ 7$

These are diploid cells and hence the number of nucleosomes will be 2n

Hence, the total number of nucleosomes are

$1.55 * 10^7 * 2\\3.1 * 10^7\\$

Hence, option C is correct

5 0

3 years ago

This is the common name for photosynthetic protists that occur in unicellular, colonial and multicellular form; many of their na

Ymorist [56]

This state is talking about Algae.

Indeed, the algae can be classified according to their pigmentation. In the broadest sense of the term, algae gather:

* Prokaryotic organisms: Cyanobacteria (formerly called "blue-green algae" or Cyanophyceae);

* Eukaryotes:

-various groups with unicellular species (Euglenophytes, Cryptophytes, Haptophytes, Glaucophytes, etc.),

-other groups with unicellular or multicellular species:

"red algae" or Rhodophyta,

Stramenopiles (including diatoms and "brown algae" or Phéophycées),

-and finally, plants quite close to terrestrial plants: "green algae", which include, among others, Ulvophyceae.

3 0

4 years ago

Which of the following is true of all invertebrates

siniylev [52]

Answer: They all do not have bones

Explanation:

The suffix in- means no, and vertebrate is a backbone so, the have no backbone.

4 0

4 years ago