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Hoochie [10]
3 years ago
15

Daniel removes 72 blocks from a jar. There

Biology
1 answer:
Natalka [10]3 years ago
7 0

Answer:

12

Explanation:

84-72=12

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how do you identify a pure metal if you have a balance of a graduated cylinder and a table of densities for metals?
sattari [20]
We determine the mass of the metal in grams by weighing it using the balance. Next we obtain the volume of the metal by measuring its displacement with a graduated cylinder and water in the following way: 1.measure amount of water in the graduated cylinder. 2. Place metal into the graduated cylinder 3. Measure the amount of water in the graduated cylinder 4. Subtract step 1 from step 3. The difference is the metal's volume. Once we have found out the mass and the volume then we calculate the density using the formula: Density = Mass/Volume. We then check our answer from the known densities of metals in the table of densities that has been provided and determine the identity and purity of the metal by how close our answer is to the most probable value in the table.
4 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
Genome editing techniques have been developed to exploit the CRISPR system of bacteria and archaea. Only the _____ component of
Bess [88]

Answer:

Cas9

Explanation:

Genome editing techniques have been developed to exploit the CRISPR system of bacteria and archaea. Only the Cas9 component of the system is used in editing.

7 0
2 years ago
A farmer crosses a purple-flowered pea plant with a white-flowered pea plant and plants the seeds. The farmer observes that all
Musya8 [376]

Note about the question:

Probably there are options for this question, but I failed in finding them. However, in the explanation box I will explain the reason for the lack of white flowers in the F1.

Answer:

The purple phenotype is dominant over the white phenotype. The allele that expresses the purple color is dominant and, in a heterozygous state, hides the expression of the recessive allele that expresses the white color. Principle of dominance.

Explanation:

Due to technical problems, you will find the complete explanation in the attached files.

Download pdf
6 0
3 years ago
The DNA segment that carries information for building one protein or polypeptide chain is called a(n) ________.
kirill115 [55]

Answer:

The correct answer is a gene

Explanation:

The DNA segment that carries information for coding one protein or polypeptide is called a gene. According to one gene-one polypeptide hypothesis, each gene is responsible for making a single chain of the polypeptide.

Originally it was said that one gene codes for one enzyme but later it was found that some gene also codes for non-enzyme proteins and single polypeptide chains. So after this research, the theory was modified and one gene-one polypeptide theory came. Therefore the right answer is gene.

8 0
3 years ago
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