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DedPeter [7]
2 years ago
14

Describe how facilitated diffusion helps large molecules cross cell membranes. What kinds of proteins are involved?

Biology
2 answers:
Dima020 [189]2 years ago
3 0

Yeah yeah so :D,

Large polar molecules can only cross the membrane with the help of protein named channel protein and carrier protein.

So, this both proteins act like a gate, the large molecules enter the protein and the protein let the large molecules in to the membrane. (see the picture so that you can understand more, its carrier protein)

the only difference between channel protein and carrier protein is, channel proteins has fixed shape while carrier protein can flip.

Semmy [17]2 years ago
3 0

Large or polar molecules like glucose can't pass through the phospholipid bilayer. Smaller molecules usually diffuse freely for example water and CO2.

Large molecules like glucose diffuse through channels. This is a form of passive transport.  Carrier proteins are involved.

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Which of the following is not a macromolecule?
Sindrei [870]


The correct answer is a - Lipid

Lipids are not considered as macromolecules because unlike proteins, carbohydrates and nucleic acids which polymers, lipids are composed of a single unit made up a glycerol backbone to which two or three fatty acids are linked.

Lipids are not polymers made up of individual subunits called monomers. They contain only  one molecule and are not macromolecuels.

Examples of lipids include waxes, steroids, phospholipids and detergents. Lipids are generally hydrophobic and insoluble in water.



5 0
3 years ago
A molecule that has regions of partial positive and partial negative charge
nasty-shy [4]

Answer:

A) polar

Explanation:

Polar molecules contains  partial positive and partial negative charge as in all polar molecules two atoms have unequal sharing electron. Due to unequal sharing of electrons, one atom that attracts valence electrons strongly gains positive charge and other gain negative charge.

For example water, water is a polar molecule having partial negative and partial positive charge because the oxygen atom in water attracts electrons more strongly than the hydrogen atoms.

Hence, the correct answer is "A) polar".

7 0
3 years ago
Prokaryotes, like most living organisms, need movement to locate food and to survive.
zmey [24]

Answer:

Explanation:

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6 0
3 years ago
The development of what factored in the development of complex organisms
maxonik [38]
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Reptiles evolved from an ancestor of amphibians that developed an egg with a strong outer shell that kept it from drying out. The correct option is the first option.
3 0
3 years ago
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This question is long and it is late here, but I can help you understand it. DNA consists of 4 nucleotide bases: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G). When DNA is transferred to RNA, you use the complimentary nucleotide base to each as follows:
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So, the DNA code ‘TAC’ will have the mRNA complimentary strand of ‘AUG’. When changing mRNA to tRNA, you do as follows:
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For example, mRNA codon AUG codes for the amino acid Methionine. Hope this helps.
8 0
2 years ago
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