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aleksklad [387]
3 years ago
8

Four friends were talking about human DNA, genes, and chromosomes. They each had different ideas about where these structures we

re found. This is what they said.
Bella: "I think DNA is found on genes."
Kyra: "I think chromosomes are found on genes."
Kurt: "I think genes are found on DNA."
Joan: "I think chromosomes are found on DNA."

Who is correct? Explain why you think so.
Biology
1 answer:
-BARSIC- [3]3 years ago
7 0
Kurt: " I think genes are found on DNA." Because genes are actually coded by the base sequence of a DNA strand.
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In vertebrates, which structure frequently serves as the first intermediary between the areas of the brain that perceive sensory
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Explanation:

sorry, I may use old terms; I believe it is at the hypothalamus, for endocrine system...

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In prehistoric times volcanic eruptions caused mass extinctions of many species of marine organisms attached to the ocean floor.
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The image shows a magnified view of a leaf's surface with the stomata visible. What’s the significance of these structures in th
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The correct answer is option (d) They allow the exchange of gases between cells in the leaf and the external environment.

Stomata are the tiny openings present in the epidermis (outer layer of cells) of the leaf. They have a pore which is guarded by the guard cells which controls the opening and closing of the stomata. Air enters and exits through the stomata.

The main funtion of stomata is to facilitate the gaseous exchange. The gas exchange that occurs when the stomata are open helps in the process of photosynthesis. During photosynthesis, carbon dioxide is taken in from the atmosphere and oxygen is released as a by-product of photosynthesis. The glucose produced is converted into the starch and stored in the leaves.

Also, water vapour diffuses through the stomata into the atmosphere by a process called the transpiration.

Thus, stomata are the structures that are mainly involved in the gaseous exchange between the cells of the leaf and the atmosphere.

8 0
3 years ago
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Two students decide to repeat the Hershey and Chase experiment with modifications. They decide to label the nitrogen of the DNA,
Ipatiy [6.2K]

Answer:

radioactivity will not be able to tell the difference between the DNA and proteins

Explanation:

It seems that the experiment will fail to show what Hershey and Chase showed because they modify some of the aspects. These modifications will cause changes to the results, the main one being that radioactivity will not be able to tell the difference between the DNA and proteins. This is because Amino Acids are proteins that also contain nitrogen atoms, thus labeling the nitrogen would include all DNA and proteins. This being the main reason why Hershey and Chase decided to label the DNA instead.

4 0
3 years ago
. What is the relationship between quantity demanded and quantity supplied at equilibrium? What is the relationship when there i
Zanzabum

Answer:

  • At equilibrium, the quantity of a commodity demanded is the same as the quantity of that commodity supplied. i.e. QD = QS. The price at which QD = QS is the equilibrium price.
  • When there is a shortage, the quantity of goods demanded would be greater than quantity supplied, as the price falls below the equilibrium price. i.e. QD>QS
  • When there is surplus, the quantity of goods demanded is less than the quantity supplied, as price increases above the equilibrium price. i.e. QD<QS.

For example, in the table showing the demand and supply schedule for T shirt at different prices (see file attached), the equilibrium price for a unit of T shirt is $3, at equilibrium, QD = QS (i.e. 30 = 30).

A shortage is recorded when the price of T shirt falls below equilibrium price of $3 as shortage of T shirt is recorded, i.e. @ $2, QD>QS (40>20). A shortage of 20 is recorded.

Surplus occurs as price increases above equilibrium price of which QD<QD, i.e. @ $4, a surplus of 20 is recorded.

5 0
3 years ago
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