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3 years ago

What would go wrong if a cell did not replicate its DNA before beginning mintosis?

1 answer:

7 0

If a cell did not replicate its DNA (during the S-phase) before beginning mitosis, then the two identical daughter cells would only get one chromosome from each pair. This, instead of the normal (diploid) 2 pairs of each chromosome (2×23=46), would lead to two haploid cells with 23 total chromosomes each. They would be unable to function and sustain life, thus would likely die soon after division.

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Salt water has a greater density than fresh water. If an egg sinks to the bottom in a container of fresh water, what can you do

n200080 [17]

The correct answer is C.

The egg sinks in freshwater because it is more dense than the water. So, to make the egg float, you would have to increase the density of the water. Since salt water has a greater density than freshwater, you would add salt to the freshwater, thus causing the egg to float rather than sink.

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3 years ago

Humans depend on the biodiversity of living things for all of the

Contact [7]

The answer to your question is c!

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3 years ago

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The relationship between the frog and the insects is a relationship. If the number of frogs in the ecosystem decreased because o

iragen [17]

The number of insects will increase

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what are structures without a present-day function called? a. homologous c. vestigial b. analogous d. extinct

Lesechka [4]

C. Vestigial.

A vestigial structure example in out bodies is the Appendix. We don't really need it, it just kind of "hangs out" in our bodies. We evolved to not need it.

I hope this helped! Let me know if it did not!
I hope you have a fantastical day!!!XD

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3 years ago

Build a dichotomous key to all the tissues you have seen in the lab. For this, you can use any of their morphological characteri

Mrac [35]

Answer + Explanation

Epithelia:

Simple squamous epithelium :single layer, flattened cells

Simple cuboidal epithelium : single layer, cube shaped cells

Simple columnar epithelium : single layer, elongated cells

Pseudostratified columnar epithelium : single layer, elongated cells

Stratified squamous epithelium : multilayered layers, top cells flattened

Stratified cuboidal epithelium : multilayered , cube shaped cells

Stratified columnar epithelium :top layer of elongated cells, lower layers off cube shaped cells

Transitional epithelium: many layers of cube shaped cells and elongated cells

Goblet epithelium : unicellular or multicellular.

Connective tissue ---

Areolar: consist of fibroblasts, macrophages, adipocytes, mast cells, plasma cells

Loosely arranged collagen, reticular and elastic fibers an gelatinous ground substance.

Adipose : adipocytes, fibres are reticular and collagen

Closely packed cells with a small amount of gelatinous ground substance.

Hyaline cartilage : chondrocytes, collagen fibers

Limited ground substance, dense and gel matrix.

Elastic cartilage : chondrocytes, elastic fibers

Limited ground substance, flexible but firm gel matrix.

Fibrocartilage: chondrocytes, collagen fibers

Limited ground substance intermediate between Hyaline cartilage and dense connective tissue.

Bone--- osteoblasts and introduced cells ,collagen fibres

Blood --- erythrocytes, leukocytes, platelets

Muscle ----

Striated skeletal muscles have characteristic cross-striations which are due to the regular arrangement of contractile elements, the sarcomeres.multinucleated.

Cardiac muscle are strained. Branched and shaped like fibers cross each other. One nucleus per cell.

Smooth muscles, as their name implies, do not have cross-striations. They are generally lighter in color than striated muscles.one nucleus per cell.

Both neurons and global cells consist of cell bodies and cell processes

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3 years ago