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aalyn [17]
2 years ago
8

If these rock layers have been undisturbed, which layer is the youngest?

Biology
2 answers:
Nata [24]2 years ago
7 0

Answer: A

Explanation:

Katena32 [7]2 years ago
5 0

Answer:

I think it is A, because the rocks that are at the top are the youngest and the ones that are on the bottom are the oldest.

Explanation:

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If a boy exhibits a sex-linked trait that is carried on the X chromosome, what must be true?
Artemon [7]

Answer:

C. His mother carried at least one allele for that trait

Explanation:

-Men have a single allele of each gene on the X chromosome, inherited from their mother, and a single allele of each gene on the Y chromosome, from their father.

-A sex-linked trait is a trait that is controlled by a gene or an allele located on the sex chromosome.

-X-linked traits are maternally inherited from carrier mothers or from an affected father. Each son born to a carrier mother has a 50% probability of inheriting the X-chromosome carrying the mutant allele.

3 0
2 years ago
Read 2 more answers
Receptors for ________, peptide hormones, and eicosanoids are found in the cell membranes of target cells.
Vsevolod [243]
The answer is Catecholamine. It is any of a class of aromatic amines that includes a number of neurotransmitters such as epinephrine and dopamine. The adrenergic receptors are a class of G protein-coupled receptors that are targets of the catecholamines, especially norepinephrine (noradrenaline) and epinephrine (adrenaline). These three - catecholamine, peptide hormones and eicosanoids acts as extracellular membrane receptors which means that these receptors are embedded in the membranes of cells. They act in cell signaling by receiving (binding to) extracellular molecules.
6 0
2 years ago
A birds newly grown feathers are called?
11Alexandr11 [23.1K]
Vaned feathers maybe?

5 0
3 years ago
Gene expression in eukaryotes can be regulated at many different levels. List the different levels of regulation, and explain wh
Aneli [31]

Answer:

Transcription, mRNA (processing, transport, localization and stability), translation.

Explanation:

  • Transcription is regulated in two levels, though chromatin regulation (methylation and acetylation) to loose or increase histone's affinity to DNA and through cis and trans elements such as promoters, enhancers, and silencers (cis) to active/deactivate and RNA polymerase and transcription factors and co-factors (trans).
  • mRNA can be regulated using poly-A tails or 5'-caps to shorten or give them more time before they degrade, it could also be spliced to eliminate introns.
  • In the translation stage, the regulation occurs during the initiation through a scanning procedure that ensures the 40s ribosomal subunit bind correctly to the untranslated portion of RNA

Hope this information is useful to you!

4 0
3 years ago
Which of the following best describes a benefit of one type of non-renewable energy?
oksian1 [2.3K]

D

Unlike carbon-based fuels like coal, natural gas, and petroleum, nuclear energy does not release greenhouse gases into the atmosphere. Therefore it does not contribute to global warming.

Explanation:

Nonetheless, nuclear energy is not widely adopted for energy because of its safety concerns. Fission energy is harmful to the environment because of nuclear waste it generates. How this nuclear waste is stored is very important because leakage can lead to contamination of an environs with lethal radioactive elements.

Learn More:

For more on nuclear energy check out these;

brainly.com/question/9935260

brainly.com/question/1013815

#LearnWithBrainly

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3 years ago
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