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loris [4]
3 years ago
5

Otter cubs are born in a burrow under the ground. How does this help the otter cubs survive

Biology
2 answers:
borishaifa [10]3 years ago
8 0

Answer:

it keeps preterders away so the cubs can stay safe

Explanation:

Mazyrski [523]3 years ago
6 0
It helps them stay safe from predators
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Which statement(s) correctly compare the masses of protons, neutrons, and electrons? Check all that apply.
densk [106]

Answer:

Protons and neutrons have similar mass.

Electrons are smaller than a proton or a neutron.

Explanation:

Protons and neutrons have approximately the same mass, but they are both much more massive than electrons

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Which describes a grizzly bear’s habitat?
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The physical area where the bear lives describes a grizzly bear’s habitat because habitat is <span>the natural home or environment of an animal.

D.</span><span>The physical area where the bear lives</span>
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Which diagram correctly describes the changes that occur as a small piece of rock falls from space and hits the Earth?
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The answer correct would be c

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2 years ago
Which is a mechanism for restricting the movement of proteins in the plasma membrane? Choose one or more:
alexgriva [62]

Answer:

The correct answers are option A. "tethering proteins to the cell cortex", B. "using barriers such as tight junctions", C. "tethering proteins to the extracellular matrix", D. "forming a covalent linkage with membrane lipids", E. "tethering proteins to the surface of another cell"

Explanation:

According to the fluid-mosaic model, the components of cell membranes are in constant movement forming a barrier to avoid unwanted exterior component internalization and to avoid the loss of precious internal components. This constant movement could cause that proteins move across the plasma membrane. But, this is avoided by several mechanisms including:

A. Tethering proteins to the cell cortex. The cell cortex is a rigid structure made of actin and actomyosin. Proteins found in the plasma membrane are tethered to this structure to restrict their movement.

B. Using barriers such as tight junctions. Tight junctions are barriers found in epithelia made of claudin and occludin proteins. These barriers are impenetrable, which avoid the movement of proteins in the cell membrane.

C. Tethering proteins to the extracellular matrix. The extracellular matrix is made of several proteins and macromolecules that provide a structural and biochemical support to cells that are nearby. Proteins could be tethered to this rigid structure as well.

D. Forming a covalent linkage with membrane lipids. The proteins in the cell membrane that form a covalent linkage with membrane lipids are known as lipid-anchored proteins, or lipid-linked proteins.

E. Tethering proteins to the surface of another cell. When cell-cell communication take place it is possible that proteins in the cell membrane got tethered to the surface of the other cell.

6 0
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