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melamori03 [73]
3 years ago
8

Who were the first guys to build a model of a DNA structure? (Thank you :). )

Biology
1 answer:
Keith_Richards [23]3 years ago
3 0

Answer:

James Watson and Francis Crick were mainly the first to build a model of a DNA structure. (Your welcome).

Explanation:

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In which of the following environments would slime molds most likely exist?
stellarik [79]

Answer:

on the floor of a forest

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3 years ago
When NADH passes its electrons into the Electron Transport System, NADH is chemically:
erik [133]

Answer:

Option D, oxidized

Explanation:

The NADH gets oxidised when it passes its electrons into the Electron Transport System

Oxidization is a process in which one element or compound loses its electron to other chemical element or compound thereby itself getting oxidised and reducing the other one (the one who gains the electron).

Here in the electron transport system, the NADH loses or donates its electron to the Electron Transport System thus chemically it gets oxidized.

Hence, option D is correct

8 0
3 years ago
What membrane activities requires energy from atp hydrolysis?
NikAS [45]

Answer:

active transport, like Na + ions leaving the cell

Explanation:

The active transport requires an energy expenditure to transport the molecule from one side of the membrane to the other, but the active transport is the only one that can transport molecules against a concentration gradient, just as the diffusion facilitated the active transport is limited by the number of transport proteins present.

Two major categories of active, primary and secondary transport are of interest. The primary active transport uses energy (generally obtained from ATP hydrolysis), at the level of the same membrane protein producing a conformational change that results in the transport of a molecule through the protein.

The best known example is the Na + / K + pump. The Na + / K + pump performs a countertransport ("antyport") transports K + into the cell and Na + outside it, at the same time, spending on the ATP process.

The secondary active transport uses energy to establish a gradient across the cell membrane, and then uses that gradient to transport a molecule of interest against its concentration gradient.

8 0
3 years ago
7)
GrogVix [38]

Answer:

C)  DNA or RNA

Explanation:

Genetic material is found in both viruses and in living single-celled organisms, such as protozoans and bacteria.

8 0
3 years ago
Choose the best answer to complete the sentence. Directional selection can be distinguished from disruptive selection by _______
Vinvika [58]
I think the correct answer from the choices listed above is option A. Directional selection can be distinguished from disruptive selection by the elimination of extreme variations of traits. Directional selection is a natural selection where an extreme phenotype is favored than others.
6 0
3 years ago
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