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3 years ago

Organic compounds do NOT contain which of the following?

2 answers:

7 0

<span>In the 19th century is was assumed that organic compounds could only be produced by plants and animals. These compounds all had carbon and hydrogen in common. Some organic compounds also include O, N, the halogens, S and a few other elements.

Now we know that organic compounds can be synthesized in the laboratory. Simple compounds of carbon and hydrogen include the alkanes and alkenes, for instance, as well as aromatics like benzene. But oxygen is a common element in organic compounds like alcohols, aldehydes, ketones and ethers.

So the bottom line is that all organic compounds contain C and H and some contain O as well, but O is not required to be an organic compound.

========= Follow up ==========

Why are these people saying "yes". It's obvious that there are many organic compounds that don't contain oxygen</span>

QveST [7]3 years ago

6 0

Okay... glad you got it but it is good to share in case someone else needs that answer :)

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A cat standing near a pond looking at the fish in water. Which of the following statement is correct?

salantis [7]

Answer:

The fish appears nearer to the cat than it really is

Explanation:

The situation above is related to the refraction of light. The cat will think that the fish is closer to him, however, it is actually at a<u> different depth</u> in its<em> actual position</em>. This is because of the refraction of light as it travels in two different mediums: <em>water and air.</em> The eyes and brains are<u> not capable of tracing the light rays' refraction,</u> thus, the cat's image of the fish is on a shallower depth. In reality, the light rays reflecting from the fish are actually being refracted on the water's surface.

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3 years ago

Which of the following is a scientific observation about the snake pictured below?

Fynjy0 [20]

Answer:

Adult cottonmouths are brown.

Explanation:

An observation is a fact that you can clearly see and don't have to guess if it is true or not.

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3 years ago

Which three statements are central ideas in Roosevelt's "What I Hope to Leave Behind"?

Harrizon [31]

<em>In Roosevelt's speech, some of her main ideas are:</em>

'It would be better if people were not so busy competing with each other

'The role of women is changing'

'a good home life is based on strong relationships'.

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3 years ago

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Darwin was very interested in the observation that animals on distant and isolated landmasses appeared to be related to animals

AVprozaik [17]

Answer: Option B.

Biogeographical

Explanation:

Biogeographical evidence is the evidence that provide information of organisms distribution over geographical areas. It provide information on how and when the organisms evolved and common descent.

Frombthe question, biogeographical evidence will help Darwin make his observation

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3 years ago

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The pedigree below tracks the presence of dimples through a family's generation. Having dimples is an autosomal dominant trait.

yulyashka [42]

A pedigree is a representation of a family history tracking a trait. The graph shows the inheritance pattern of the trait and its expression through several generations.

<h3>What is an autosomal dominant trait?</h3>

The autosomal dominant trait is the characteristic that is coded by a gene located in an autosomal chromosome (this is, not a sexual chromosome).

This trait is dominant because it is coded by the dominant allele, meaning that the recessive allele codes for the absence of dimples. The presence of only one dominant allele in the genotype is enough for the idividual to express dimples.

<u> Genotype Phenotype </u>

DD, Homozygous dominant Dimples

Dd, Heterozygous Dimples

dd, Homozygous recessive No Dimples

<h3>What is a pedigree?</h3>

The pedigree is the representation of a family history conserning a certain trait. In this case, dimples.

The pedigree shows the expression -and inheritance pattern- of the trait through several generations.

To correctly interpret a pedigree, we need to know that

Family members

→ Individuals are represented with geometrical figures.

→ Males are squares

→ Females are circles

Trait/Phenotype

→ Healthy/normal/not affected individuals are represented with empty figures

→ Affected/mutated individuals are represented with solid black figures

Generations

→ Each file is represented with a roman number, indicating the Generation.

Here we will assume that

Individuals represented with solid figures express dimples -shaded individuals-. They can be either DD or Dd. This is because dimples is not usuall.

Individuals with no dimples are represented with empty figures and are dd.

According to the provided pedigree,

I-1 ⇒ man DD or Dd

I-2 ⇒ woman dd

II-1 ⇒ man Dd or DD

II-2 ⇒ woman dd

II - 5 ⇒ woman dd

III - 1 ⇒ man Dd

III- 2 ⇒ woman dd

III - 6 ⇒ woman dd

Since this pedigree does not specify the relationship between individuals, I can not answer the question based on it. So, I will attach another tree to specify genotypes.

I advise you study this new example, and then follow the same reasoning to choose the correct individual according to you pedigree.

Yo can learn more about pedigrees at

brainly.com/question/19516649

#SPJ1

7 0

1 year ago