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S_A_V [24]
1 year ago
13

A scientist notices that when she adds a small, water-soluble molecule to a dish of cells, the cells turn off transcription of a

gene. She hypothesizes that the ligand she added binds to a(n) ______ receptor. Intracellular Hormone Enzyme-linked Gated ion channel-linked
Biology
1 answer:
Lelechka [254]1 year ago
7 0

Answer:

Enzyme-linked

Explanation:

The cell surface receptors that have intracellular domains associated with enzymes are called enzyme-linked receptors. The added molecule was water-soluble and cannot pass through the membrane to bind to intracellular receptors. Binding of the added molecule to the enzyme-linked receptor led to the activation of associated enzymes to generate the response (down-regulation of expression of the target gene).

Examples of enzyme-linked receptors include tyrosine kinase receptors. Binding of the signaling molecule to these receptors triggers phosphorylation of the intracellular domain which in turn transmits the signal to the cytoplasmic messenger.

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In response to seasonal changes in temperature, many organisms must alter the composition of their plasma membranes to maintain
aleksandrvk [35]

Answer:

C. a decrease in phospholipid fatty acid side chain length and a decrease in side chain saturation

Explanation:

Temperature is a factor that has a huge impact on cell membrane structure, more precisely its fluidity. So, for example, if temperature increases, the cell membrane becomes more fluid because the fatty acid tails of the phospholipids become less rigid.

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1 year ago
Reactants capable of interacting to form products in a chemical reaction must first overcome a thermodynamic barrier known as th
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What is the advantage to a scientist in using a line drawing rather than a ball-and-stick model or Lewis structure?
frutty [35]

Answer:

It saves time

Explanation:

You don't have to draw unnecessary details for complex structures

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2 years ago
In 1986, a nuclear power accident in Chernobyl, USSR (now Ukraine), led to high radiation levels for miles surrounding the plant
riadik2000 [5.3K]

Answer:

Radiation leads to mutations that causes genetic drift and decrease fitness.

Explanation:

Radiation is responsible for changing or altering the DNA sequence within a cell.

Radiation either causes mutation or it leads to cell death.

Most of the ionizing radiation causes mutation within the  deep inside of our cells which eventually leads genetic drift which means change in the frequency of the allele in a population over time.

Beneficial mutation confer advantage to the organism. But in this case, the mutation is not beneficial and decreases the fitness of the rodent organisms.  

6 0
2 years ago
Which of the following is the correct sequence, going from simplest to most complex, in the levels of structural organization of
Bas_tet [7]

Answer:

The correct answer is option A.

Explanation:

Cellular organization is one of the characteristics of life that states that each living organism is made up cell or more than one cell, that is made up by organization of various components such as chemicals like micro molecule that form the macro molecule and these chemical level structural organization is formed together to make cells and this level of organization makes the tissue which is complex to cell but simpler to organ that is makeup of various together.

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Thus, the correct answer is option A.

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1 year ago
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