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Delvig [45]
3 years ago
9

Which molecules are not able to permeate the cell membrane

Biology
1 answer:
max2010maxim [7]3 years ago
6 0

Answer:

Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot. Charged molecules, such as ions, are unable to diffuse through a phospholipid bilayer regardless of size; even H+ ions cannot cross a lipid bilayer by free diffusion.

Explanation:

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Binding Ca2+ to the troponin complex causes ____________ to move
mylen [45]

Answer:

Tropomyosin

Explanation:

The calcium binding to troponin and induces the muscle contraction. The active binding site gets exposed due to the calcium binding.

The calcium ions then attaches with troponin molecule. This changes the shape of troponin and removes the tropomyosin protein from the binding site.  No ATP is available during this process.

Thus, the correct answer is option (d).

7 0
3 years ago
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Consider this animal cell which organelle is labeled A
Rom4ik [11]
The organelle which labelled A is C. golgi apparatus
6 0
3 years ago
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"You discover a new species of snail, Biologica terificia, and find that its haploid number is 4 (n = 4). The somatic cells of B
Georgia [21]

Answer:

8 chromosomes

Explanation:

Diploid state is when an organism have two set of chromosomes (2n) i.e. combination of two haploid (n) gametes containing one set of chromosome each. Sexually reproducing organisms whose somatic or body cells are diploid (2n) undergo meiosis to produce gametes or sex cells with haploid number (n).

Therefore, in the newly discovered Biologica terificia species of snail, if the haploid state (n) of their gametes is 4, then their diploid (2n) somatic cells must be 4 × 2 = 8.

The question specifies the chromosomal number at the G1 phase of Interphase. At this stage, the cell is preparing to undergo division by increasing in size and duplicating its organnelles but not yet its genetic material which is not until the next phase called S-phase. Hence, the chromosome number of somatic cells remain 8 at the G1 phase.

6 0
3 years ago
Vaccinations help prepare the body to fight invasions of a specific pathogen by
zysi [14]

Answer:

2. Stimulating antibody production.

Explanation:

5 0
3 years ago
The drawing below illustrates a small portion of the molecules that make up a cell membrane. What is the primary function of the
Ket [755]

Answer:

The correct option is b

Explanation:

Phospholipids are lipids that contains a phosphate group, which forms the "head" of the molecule and is hydrophilic (water loving). The "tail" of phospholipids is made of two fatty acids which are hydrophobic (water fearing). The phospholipid in the cell membrane acts as a selectively permeable barrier that regulates what goes in and out of the cell <u>thereby protecting the cell from some external molecules and ions</u>.

7 0
3 years ago
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