Answer:
Positive and negative feedback differs in that positive feedback loops increase the initial signal, while negative feedback loops decrease the original signal (option d).
Explanation:
Feedback is a process that, applied to biological systems, allows for the changes needed to maintain homeostasis.
- Negative feedback loop occurs when a stimulus is presented, producing a change in the body, so the response is to stop the change that is occurring. It is the most frequent type of feedback and has the greatest impact on homeostasis. An example of negative feedback is a decrease in body temperature through sweating.
- Positive feedback loop occurs when the stimulus produces a change and promotes a response that reinforces that change. The classic example of positive feedback is the secretion of oxytocin, promoted by uterine contractions, whose effect is to increase those contractions, allowing labor.
<em>In summary, </em><u><em>positive feedback loop acts by increasing an action or signal in the body, while the negative feedback loop reduces or stops the action or signal that occurs</em></u><em>.</em>
Answer:
The DNA is packed in such a way that it fits into the nucleus.
Explanation:
The DNA of each chromosome undergoes coiling, compaction and again coiling to fit into the nucleus.
At the primary level, the DNA is packed around a group of proteins called the histones.
The condensed structure that is formed by the process of coiling is called chromatin. The DNA remains in this shape throughout until it has to carry out replication.
The coiling is only unwrapped at the time of replication of the DNA.
The smooth Er is involved in the synthesis of lipids
Answer: Option B.
Is regulated by erythropoiten.
Explanation:
Erythropoietin is an hormone produced by the kidney in order to promote the formation of red blood cells by the bone marrow. Since the red blood cells carries oxygen to parts of the body, this help in oxygen consumption of the kidney. Oxygen consumption by the kidney is regulated by erythropoietin
Answer:
They can change over time because when you combine two different species together they can turn into a new and different specie. This shows that artificial selection can provide evidence that species can change over time.
