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Aloiza [94]
3 years ago
5

Which of these statements about molecules is true? A. All molecules only contain one element

Biology
1 answer:
Eva8 [605]3 years ago
4 0

Answer: D

Explanation: Atoms in a molecule can only be seperated by a nuclear reaction

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Imagine walking through a tropical rainforest. You notice that there are different types of trees, birds, insects, and other org
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Answer:

B. Organisms in each ecological system have evolved in that system and have adaptations suited for that environment.

Explanation:

According to natural selection theory, organisms need to continuously adapt and evolve within an environment or risk being wiped away from that environment.

Organisms that are not able to adapt to an environment are gradually replaced by those that have the capability to adapt and survive in that environment.

Those that are able to survive go ahead to reproduce and give rise to offspring with inherent ability to survive while those that cannot survive die off.

The correct option is B.

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3 years ago
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The wild-type form of a gene encodes a protein of length 100 amino acids. A mutant allele has a UAA (instead of the wild-type, C
Orlov [11]

Answer:

48 amino acids

Explanation:

The wild type gene codes for a protein with 100 amino acids. One amino acid is encoded by one triplet code of the gene. This means that the wild type gene has a total 100 triplets or 300 nucleotides to code for a protein of 100 amino acid. Mutation in this protein has introduced the code "UAA" at the 49th codon. The code "UAA" is a stop codon. Therefore, the mRNA transcribed from the mutant allele would code for a protein having 48 amino acids as the protein synthesis will be stopped once the stop codon at the 49th position is read.

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3 years ago
What is the name of the organ that lines part of the wall of the uterus and nourishes the embryo with substances from the mother
lana [24]
This organ is called a placenta.
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3 years ago
Which of these activities increases the amount of carbon in the atmosphere?
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Answer:

B.

burning of fossil fuels

it increase the amount of carbon present in atmosphere.

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How did geologists decide where one division of the geologic time scale ends and the next begins?
algol [13]

Answer:The placement of fossils throughout the sruface layers of earth

Explanation:

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