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kupik [55]
3 years ago
15

Researchers hypothesized that cocaine is pharmacologically active in primate fetal brain when pregnant primates are administered

cocaine at doses typically used by human drug users. What experimental observation best supports this hypothesis?
A. Glucose metabolism in the fetal brain increased
B. Imaging studies showed that cocaine entered the fetal circulation
C. The fetus had an increase in tolerance to pain
D. Imaging studies showed internalization of dopamine receptors
Biology
1 answer:
pav-90 [236]3 years ago
6 0

Answer:

Option A, Glucose metabolism in the fetal brain increased

Explanation:

Usage of cocaine during pregnancy is prohibited. However, in case if cocaine is taken it disrupts the metabolism as it increases brain glucose metabolism to the level of an adult human being. Since glucose metabolism in brain is a sensitive process, any disruption in it can lead to unaccounted effects such as dysfunctional circulation, and pharmacological effect. Cocaine increases the dopamine by blocking the dopamine transporters thereby increasing the Vmax. Since the brain of a child has all kind of neurochemical components, cocaine intakes by a pregnant woman produces reinforcing effects in brain of fetus and also make it pharmacologically active

Hence, option A  is correct

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A scientist thinks that a certain chemical is a mutagen. She exposes plant cells to a large amount of this chemical in the labor
bekas [8.4K]

Answer:

The cells change after being exposed to the chemical, and this change is passed to the next generation of cells.

Explanation:

A mutation is any change, whether big or small, that occurs to the nucleotide sequence of a gene in a cell as caused by mistake during replication or induced by a mutation causing substance. These mutation-causing substances are called MUTAGEN.

A MUTAGEN is any substance that causes genetic mutation in an organism's cell. These changes in the nucleotide sequence can affect one or more phenotypic characteristics of the affected organism, which is also passed to offsprings because it is a genetic change.

Hence, a plant cell exposed to this mutagen will be induced to mutate.

Hence, the cells changing after being exposed to the chemical, which is also passed to the next generation of cells best provides explanation that the chemical is a MUTAGEN.

4 0
3 years ago
What factor of phylogenies enable us to determine that all terrestrial mammals are quadrupedal (walk on all four legs) except hu
ankoles [38]

<u>Answer:</u>

Common ancestor is the main factor that determines that all terrestrial animals are quadrupedal.

<u>Explanation:</u>

  • Phylogeny means the evolution of the organisms or genetically related organism and how they are related.
  • The study of phylogeny is called as phylogenetics. Terrestrial means those who live on land.
  • Mammals are one who gives birth to their offspring directly. They are generally warm-blooded, breath air.
  • Studying each state of the ancestor and also tracing the organism characteristics during evolution.
5 0
3 years ago
Plz help ASAP plz and thanks
kompoz [17]

Answer:

B.

Explanation:

B. is the best choice here because it is the only characteristic listed that only describes a eukaryotic cell. Both prokaryotic and eukaryotic cells have cell membranes, cytoplasm, and cillia. However, only eukaryotic cells have a nucleus to store their DNA.

8 0
3 years ago
What is 25678 decided be 1345
ad-work [718]

Answer: 19.0914498141

Explanation:

I assume that you were trying to say what is 25678 divided by 1345.

5 0
3 years ago
A small bird gathers pollen and nectar for food, but at the same time is
Angelina_Jolie [31]

Answer:

Mutualism

Explanation:

In biology, the term <em>symbiosis </em>refers to close and often long-term interactions between organisms that belong to different species. There are three main types of symbiotic relationships:

  • mutualism - both organisms benefit from their relationship
  • commensalism - one organism benefits, while the other doesn't benefit or suffer any harm
  • parasitism - one organism causes harm to the other

In the given scenario, both the bird and plant benefit from their relationship. The bird gets food, while the plant reproduces more easily. This is why their relationship is an example of mutualism.

7 0
3 years ago
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