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3 years ago

The appendix, an extension of the large intestine appears, although this is debated, to have little

Biology

1 answer:

NARA [144]3 years ago

4 0

Answer: Vestigial organ

Explanation:

Vestigial organs are those organs which were functional in ancestral organisms belonging to the same species but due to the course of evolution of body forms they become non-functional. They can be found in the body either in the same form as used to appear in the ancestors or in rudimentary or degenerated forms.

The human appendix is one of the examples of vestigial organs. It looks like a narrow tube which forms a link with a colon of the large intestine. It was functional in human herbivorous ancestors as it used to help in digestion of variety of vegetables and other plant products. The change of diet along with due course of evolution caused the appendix to become useless. But the appendix physical form remained the same in humans.

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Caffeine aids in the movement of calcium ions across cell membranes by both making it easier for the Ca2+ channels to open and b

Llana [10]

Caffeine cause dose dependent prominent increase in force of contraction and period of contraction of muscle

<u>Explanation:</u>

Caffeine is widely used in foods and drinks. Its long time use can effect central nervous system include lethargy memory, sleep disorder and anxiety.

Increase in concentration of calcium ion will result increase number of power stroke and force for contraction. However latent period and relaxation period are unaffected by caffeine. Increase in concentration of calcium ion will result increase number of power stroke and force for contraction.

Because of calcium ion release in skeletal muscle, caffeine causes peripheral manifestation such as hyper-reflexia, muscle twitching etc.

High amount of caffeine leads to increase in release of Ca2+ from sarcoplasmic reticulum. It increases tension development in single tetanic contraction and re-initiate maximum tension in fatigue single myofibre by restoring Ca2+ release from sarcoplasmic reticulum to non-fatigued levels.

8 0

3 years ago

The microtubule-organizing center found in animal cells is an identifiable structure present during all phases of the cell cycle

MaRussiya [10]

Answer:

The microtubule-organizing center found in animal cells is an identifiable structure present during all phases of the cell cycle. Specifically, it is known as the _centrosoma___.

Explanation:

The centrosome corresponds to the center from which all the structures formed by the microtubules (mitotic spindle, cilia, flagella) .

Participates in cell division, intercellular transport, cell polarity, among other functions.

6 0

3 years ago

What advantage do the offspring of a dandelion have by reproducing asexually?

Minchanka [31]

Answer:

a. Reproduction occurs rapidly

Explanation:

asexual reproduction can occur rapidly, more quickly than sexual reproduction

5 0

3 years ago

Does natural selection operate on individuals or populations

White raven [17]

I want to say individuals more so than entire populations. That being said it's because the entire populations of living things are able to evolve and move forward through slow evolution.

3 0

3 years ago

"DNA molecules were discovered in the decade after Darwin's death. make up genes and chromosomes, which are basic hereditary uni

Vlad [161]

Answer:

make up genes and chromosomes

Explanation:

Darwin is known for his theory of evolution which explained how the organism evolved on the planet and the Mendel is known for his explanation that how the traits are passed on to the generation.

But both were unaware of this that the factors which control the traits are composed of DNA.

The DNA was discovered in 1869 in the nucleus of the white blood cells but it was not established that the genetic material is the DNA as it was discovered later in 1944. The later studies on the DNA showed that the DNA forms the genes which control the trait and are present on the chromosomes.

Thus, makeup genes and chromosomes is correct.

7 0

3 years ago