<span>The elements that are found in a high proportion in Earth's crust are oxygen, aluminium, iron, calcium, potassium, sodium, and magnesium. But for your Option, I think it is B) Oxygen and Silicon. This is because Oxygen makes 46.6% while Silicon makes 27.7% of the Earth crust.</span>
Answer: A) Mitochondria and chloroplasts are found in prokaryotes.
Explanation:
Both mitochondria and chloroplasts contain their own DNA and ribosomes. The first endosymbiotic event occurred: The ancestral eukaryote consumed aerobic bacteria that evolved into mitochondria. In a second endosymbiotic event, the early eukaryote consumed photosynthetic bacteria that evolved into chloroplasts.
Drug use (especially alcohol, tobacco, and marijuana) ...
Early sexual intercourse and without protective measures. ...
Eating disorders. ...
Antisocial behavior. ...
Dropout of studies.
Examples of positive and beneficial mutation:
- Antibiotic resistance by bacteria
- Almond tree gene mutation
- Humans immunity to HIV
Examples of negative and harmful mutation
- Cystic fibrosis
- Frame shift mutation
- Cancer
Examples of neutral mutation;
- Bovine and human insulin
- Silent point mutation
- Missense mutation
<h3>What are mutation?</h3>
Mutations are results from change in gene structures that leads to variations in form that can be transferred or passed down to generations. This is usually caused by alterations in the single base unit of DNAs by insertion, deletion or rearrangement of genes or chromosomes.
Positive and beneficial mutations result in retained from of adaptation like antibiotic resistance by bacteria, harmful mutation causes harm such as cancer, while neutral has little or no effect example, silent mutations.
Learn more on mutations here: brainly.com/question/17031191
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The correct answers are:
• How soluble the hormone is in water. Depending on is it hydrophilic or hydrophobic. For example steroid hormones (derived from lipids) are hydrophobic, meaning that are insoluble in water so they must have transport protein for the blood transport.
• whether the hormone will be able to move through the cell membrane. Hormones derived from lipids are able to pass through the membrane because are able to diffuse through the lipid bilayer. Hydrophilic hormones (from amino acids) are unable to diffuse through the lipid bilayer
• whether the hormone interacts with receptors on the cell membrane.
• whether the hormone interacts with receptors inside the cell
Hormones that diffuse freely through the membrane have internal receptors. Others have cell membrane receptors.
