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ivann1987 [24]
3 years ago
11

Which of the following factors does not affect membrane permeability? View Available Hint(s) Which of the following factors does

not affect membrane permeability? The amount of cholesterol in the membrane The saturation of hydrocarbon tails in membrane phospholipids The polarity of membrane phospholipids Temperature
Biology
1 answer:
Dima020 [189]3 years ago
8 0

Answer:

The polarity of membrane phospholipids

Explanation:

The inner core of membranes is made of nonpolar tails of phospholipids which in turn makes the membranes impermeable for polar, large and charged substances since these substances cannot cross the non-polar inner core. The saturated hydrocarbon tails pack tightly and make membrane less permeable while cholesterol affects the membrane permeability by interacting with non-polar tails.

Higher temperatures make the membrane more fluid and more permeable while at lower temperatures, membranes are more rigid due to tight packing of hydrocarbon tails and less permeable. The polar heads of phospholipids make the inner and outer surface of the membrane. Therefore, the polarity of phospholipids does not affect the membrane permeability.

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Which of the following is an accurate description of an adult stem cell?
ELEN [110]

Answer;

C. Multipotent

Explanation;

-Multipotent cells are those cells that can develop into more than one cell type, however, they are more limited than pluripotent cells. Adult stem cells and cord blood stem cells are considered multipotent.

Totipotent cells on the other hand, are those cells that can form all the cell types in a body, together with the extraembryonic, or placental cells. Embryonic cells are the only cells that are totipotent within the first couple of cell divisions after fertilization.

Pluripotent cells are those cells that give rise to all of the cell types that make up the body; embryonic stem cells are considered pluripotent.

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3 years ago
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6. what is the approximate weight in kd of the band that is unique to crab muscle protein and is not found in abundance in fish?
xenn [34]

75Kda is the approximate weight of the band that is unique to crab muscle protein and is not found in abundance in fish.

An incredibly complex, naturally occurring molecule known as a protein is made up of amino acid residues connected by peptide bonds. All living things contain proteins, which are the building blocks of numerous vital biological substances like enzymes, hormones, and antibodies.

Lack of protein can result in muscle mass loss, which reduces strength, makes it more difficult to maintain balance, and slows metabolism. When your cells don't receive enough oxygen, it can also cause anemia, which makes you exhausted.

While an excess of amino acids is often eliminated, an excess of protein is typically retained as fat. Over time, this may result in weight gain, especially if you try to boost your protein consumption while consuming too many calories.

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3 0
1 year ago
In human, there are 22 pairs of chromosomes called
lara [203]

Females have two copies of the X chromosome, while males have one X and one Y chromosome. The 22 autosomes are numbered by size. The other two chromosomes, X and Y, are the sex chromosomes. This picture of the human chromosomes lined up in pairs is called a karyotype.

Of the 23 pairs of chromosomes, the first 22 pairs are called "autosomes." The final pair is called the "sex chromosomes." Sex chromosomes determine an individual's sex: females have two X chromosomes (XX), and males have an X and a Y chromosome (XY).

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3 years ago
what is a mass extinction? what is a mass extinction? an event that causes the extinction of a large fraction of earth's species
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A mass extinction event occurs when a species disappears far more quickly than it is replaced. This is typically understood as the loss of around 75% of all species over a "short" period of geological time, or fewer than 2.8 million years.

An enormous number of species were wiped out by a harsh, worldwide, swift, and selective event is mass extinction. According to marine fossils, at least 75% of all species are thought to have become extinct. The most recent mass extinction is the Cretaceous-Paleogene extinction event, which is also the only one that can be proven to have been caused by a significant asteroid impact. All non-avian dinosaur species, making up about 76 percent of all species on the earth, perished during mass extinction. The Chicxulub asteroid impact in what is now Mexico, which occurred 66 million years ago, caused an ecosystem collapse that resulted in the extinction of the dinosaurs and >75% of all land and sea species as well as the macroevolution of mammals.

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8 0
1 year ago
“*•Pls help me!!!•*”
Wittaler [7]

Answer:

<u>Cold weather</u>

Explanation:

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