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2 years ago

Explain how it is possible to have thousands of different protiens when there are only 20

1 answer:

5 0

This is possible because proteins are created from different combinations of amino-acids. While we only have 20 different kinds of aminoacids, these 20 kinds can create thousands of combinations that we can observe in our bodies and bodies of other mammals as well as other organisms.

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A net force of 2,500 N acts on an elephant with a mass of 7,000 kg. How

Tju [1.3M]

Answer:

hey 0.35

Explanation:

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2 years ago

What is a major difference between facilitated diffusion and active transport?

Daniel [21]

Here are the main points that make difference between facilitated diffusion and active transport are : facilitated diffusion goes from high to low - deffuse in a selectively permeable membrane and does not demand energy. What about active transport - it uses energy and moves against gradient- low to high. Hope it will help!

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3 years ago

What statements are true about the biological macromolecules?

Andrews [41]

Answers:

A. All biomolecules could be called carbon based molecules

B. The monomers of DNA are nucleotides

E. Cells membranes are made, in part, from phospholipids

F. The monomers if starch are monosaccharides

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3 years ago

Luis created a clay model of Earth. He used a toothpick to represent Earth's axis. The toothpick was stuck horizontally through

Natali [406]

Answer: Earth's rotation

Explanation:

Luis was most trying to model the Earth's rotation. As you know the earth rotates around it's axis once every 24 hours and this is why we have different times in the day because the sun shines on different parts of the Earth as it rotates.

Luis used the flashlight as the sun and when he used the toothpick to spin the model of earth, the model would represent earth rotating around its axis.

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2 years ago

Read 2 more answers

Fossils of Glossopteris, an extinct fern, were discovered on which continents to support the theory of continental drift? Check

Alenkasestr [34]

Accordin to Du Toit's list supporting the theory of continental drift, the correct options are A, C, ad D. Fossils of Glossopteris were discovered on Africa, Australia, and Antarctica.

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Before answering the question, let us first review some theoretical frameworks,

• The tectonic plates theory explains the movement of the different plates based on the crust movements.

• The continental drift theory explains how these movements have been taking place for millions of years.

Alfred Wegener was the first one to state the concept of continental drift.

He proposed that once all continents were together a single big continent named Pangea, and with time, they split and separated into many pieces.

The geologist Du Toit published in 1937 a list of 10 pieces of evidence that would support the theory of tectonic plates and continental drift.

Du Toit's list includes evidence of Gondwana glaciation, lithological and structural evidence, plates fitting together, and paleontological evidence.

Paleontological evidence

• Plant and animal fossils distribution suggests the existence of a big unique continent. When reconstructing the supercontinent, the areas where these fossils were found get together in the same supercontinental region.

• Glossopteris (fern) impressions are widely distributed in determined areas of Africa, South America, India, Australia and Antarctica.

• Terrestrial vertebrate fossils also support the theory. The presence of Triassic tetrapods in all continents suggests terrestrial corridors between landmasses.

Finding Glossopteris in Australia, India, South America, Antarctica and Africa suggests that continents were once together, and these species used to live in the same region.

With time, these continents diverged and got separated by the oceans. The region where Glossopteris used to live got divided.

The correct options are A, C, and D. Africa, Australia, Antarctica.

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You can learn more about Glossopteris at

brainly.com/question/984155

7 0

2 years ago