Which kind of molecules can pass unaided through the cell membrane?

1 answer:

5 0

Relatively small, Nonpolar molecules, molecules that do not posses an electrical charge can easily pass through the cell membrane unaided. Without the need of channel and or carrier proteins, basically transport proteins.

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Describe the main molecule found in nucleus and explain how it controls the cells functioning

SCORPION-xisa [38]

The main molecule found in nucleus is called DNA(deoxyribonucleic acid). This molecule is made of subunits called nucleotides. A nucleotide is made of a nitrogenous base that can be adenine, thymine, guanine or cytosine; a five carbon sugar called deoxyribose and a phosphate group. This molecule controns protein synthesis. Proteins are crucial to the cell's function.

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3 years ago

When you bring any of your fingers in contact with your thumb, this movement is called __________.when you bring any of your fin

vladimir2022 [97]

Answer:

Opposition

Explanation:

Opposition is the type of movement that is only for the hands. Opposition is them movement where you bring your finger/s in contact with your thumb. When you put it back to its anatomical position, which is beside the index finger (pointing finger) this is called <em>reposition.</em>

Retraction occurs in the scapula (Shoulder blades) and mandible (jaw). Dorsiflexion you see that happen in your foot. When you bring your toes closer to the shin. Supination is more on the forearm and foot, where you rotate it so your palms are facing forward (sole facing the other ankle for feet). Flexion is the movement of body parts where you bring them closer to each other at a joint (the angle between the two parts are lessened). Like when you bend your elbows to "flex" muscles.

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3 years ago

In prokaryotes new mutations accumulate quickly in populations, while in eukaryotes new mutations accumulate much more slowly.

Mnenie [13.5K]

Answer: Option A

Explanation:

In Prokaryotes the the rate of new mutations is much more as compared to the eukaryotes. The rate of accumulation of mutation is slow in case of eukaryote because their generation is long as compared to prokaryotes.

Prokaryotes have short generation time and large population size which enables them to accumulate the mutation quickly.

The machinery is also not that complex when it comes to prokaryotes. Transduction, conjugation and tranposable elements. So, the changes during these processes leads to mutation in the prokaryotes and can be observed quickly due to their small generation.

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Which example would result in new cells that are most different from the parent cells

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<span>sperm and egg cells uniting to produce fertilized eggs</span>

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denis-greek [22]

The odds are astronomical for a father with AB(IV) to have an O(I) child. The only possible way for this phenomenon to occur is if there was a nondisjunction in the ovogenesis for the 9th chromosome and the father also had a nondisjunction for the same chromosome(A sperm cell with no 9th chromosome fertilized an ovum with two 9 chromosomes).

A person with AB cannot donate to a person with O because the receiver has antibodies(alpha and beta) that bind to the antigens on the AB blood cells, causing death.

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