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Delicious77 [7]
2 years ago
10

When Watson and Crick built and proposed the DNA structure, they determined three important features. What were the three featur

es they proposed? Select all that apply.
Biology
1 answer:
Marrrta [24]2 years ago
3 0

The three important features proposed by Watson and Crick are as follows:

  • a phosphate group
  • a deoxyribose sugar
  • a single nitrogen-containing base

<h3>How is the structure of DNA formed?</h3>

DNA is a biological molecule that stores genetic information in living cells.

The structure of these DNA molecule was built and proposed by a duo scientist named James Watson and Francis Crick in the 1950s.

However, they determined three important features of the DNA molecule and are as follows:

  1. a phosphate group
  2. a deoxyribose sugar
  3. a single nitrogen-containing base

Learn more about DNA molecule at: brainly.com/question/264225

#SPJ1

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Digestion of an unlabeled carbohydrate results in increased amounts of the monosaccharides glucose and galactose. Which is most
swat32

Answer:

lactose  

Explanation:

Lactose is a disaccharide sugar made up of glucose and galactose monosaccharide subunits. In lactose, galactose and glucose molecules form a covalent glycosidic bond denoted as an (β-1→4) glycosidic bond. Lactase is an enzyme that hydrolyzes lactose into glucose and galactose, which can be then absorbed into the bloodstream by the cells lining the small intestine. In an alkaline solution, lactose may also isomerize to generate a mixture of lactulose (20-30%) and lactose (70-80%).

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3 years ago
Which of the following blood vessels would have the lowest blood pressure?
natta225 [31]
<span>D. one that is large in diameter and has low blood volume</span>
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3 years ago
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What is 3% of 188.241 kg
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Answer:

5.64723

Explanation:

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2 years ago
The Lac Operon is a set of genes that controls the production of lactase the enzyme that digests
Romashka [77]

Answer:

The lactose present prevents the production of lactase

Explanation:

This question is describing a set of genes in bacteria called LAC OPERON. Lac operon controls the production of lactase, which is the enzyme that digests lactose. However, this gene can be regulated at the transcription level i.e caused to be transcribed or not depending on certain factors.

According to the question, lac operon, which regulates the production of enzymes will be transcribed and subsequently translated i.e. turned on when there is a substrate (lactose) that the produced enzyme will work on. However, when there is no need of the lactase enzyme or there is absence of lactose (substrate), the lac operon gene is turned off.

Note that, the statement that "The presence of lactose prevents the production of lactase" is not correct.

4 0
3 years ago
Identify each event as the result of mechanical weathering or chemical weathering.
kow [346]

<h3><u>The following events are identified as chemical weathering:</u></h3>
  • The minerals in a marble statue react with water to form acids and pores in the structure.
  • The rocks in a region are streaked orange after being exposed to repeated rains.

<em><u>Reason: </u></em>

When the weathering process occurs due to <em>chemical reaction</em>, then it is considered as chemical weathering.

In <em>the first case</em>, minerals of marble statue are <em>reacting</em> with water to cause weathering. In the <em>second case</em>, due to the <em>acidificaion reaction</em>, the change of the color has happened after exposure to the repeated rains.

<h3><u>The following events are identified as Mechanical weathering:</u></h3>
  • A piece of rock crumbles after being constantly thrashed by strong waves.
  • Industrial runoff forms cracks in a rocky structure in its path.

<em><u>Reason:</u></em>

When the rock is broken into simple pieces <em>without any chemical reaction </em>it is considered as mechanical weathering.

In the <em>first cause</em>, due to the <em>abrasion</em> caused by the strong waves, weathering has happened, in the <em>second case</em> industrial run off may be of varying temperature and thus may cause <em>heating or cooling</em> of the rock and causes weathering.

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