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____ [38]
2 years ago
10

During meiosis, genetic recombination may occur more than once through the process of ____________________, resulting in an incr

ease in genetic variability. A) transcription B) crossing over C) allele sequencing D) frameshift mutation
Biology
2 answers:
xz_007 [3.2K]2 years ago
6 0

The right answer is B) crossing over.

Crossing-over is a genetic phenomenon that occurs during meiosis and contributes to genetic mixing during reproduction (genetic recombination).

At the end of prophase 1 (early metaphase 1) of meiosis, the homologous chromosomes (i.e. of the same pair) overlap thus forming characteristic features called "chromatid tetrads" and exchange fragments of chromatids. The result is the intra-chromosomal mixing of the alleles

IrinaVladis [17]2 years ago
6 0
<span>During meiosis, genetic recombination may occur more than once through the process of ____________________, resulting in an increase in genetic variability.

</span>Answer: crossing over (aka recombination)
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Imagine that a doctor is culturing two types of cells: one from a malignant melanoma and one from a normal skin sample. How woul
Lynna [10]

Answer:

Malignant melanoma cells would have active telomerases that constantly replenish and lengthen telomeres.

Explanation:

Telomerase can be described as enzymes which add the repetitive sequences called telomeres at the end of a chromosome. Telomeres can be described as repetitive sequences at the end of the chromosome which are involved in protecting the chromosome from any damage.

In a normal skin cell, the telomeres will shorten with time. But in a malignant skin cell, the telomerase will add the repetitive sequence again and again. The telomers will not be able to shorten.

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1 year ago
Becky is a 53-year-old woman living in Seattle, Washington, with her husband Tim and their dog Tipper. Even though they both hav
Alika [10]

Answer:

Becky’s doctor provided only supportive care because the toxin that poisoned her, the demoic acid, has no known antidotes; which happen to be the only cure for toxins.

Antimicrobial were not part of Becky's treatment because Becky was infected by a toxin and not a microbial infection.

Diatoms are not different from eukaryotic cells or eukaryotes. they are Eukaryotes, which are different from prokaryotes. However both the eukaryotes (diatoms) and the prokaryotes possess cytoplasm, plasma membrane and ribosomes.

Explanation:

Demoic acid is a marine bio-toxin that results in Amnesic Shellfish poisoning (ASP). This biotoxin is produced by diatoms of the species <em>Nitzschia navis-varingica</em> of the genus <em>Pseudo-Nitzschia</em><em>. </em>This intoxication can result in symptoms ranging from gastrointestinal upset (vomiting, nausea, diarrhea, abdominal cramps, hemorrhagic gastritis) to neurological disturbances (including headaches, diziness, disorientation, vision disturbances, loss of short term memory, motor weakness, abnormal heart rhythm, unstable blood pressure, etc.). In more severe cases, it could lead to permanent short term memory loss, brain damage, coma, and death. Due to the lack of antidotes for this toxin, it is advised that medical attention be sought as soon as possible, where the patient can be closely monitored and cared for.

There's a difference between toxins and microbial infections. while Microbial infections are caused by harmful microorganisms infecting the body tissue and cells, toxins are harmful substances produced by microorganisms. Hence, the approach for treatment for both cases are different.

Diatoms are eukaryotic cells or eukaryotes, which are organisms that have a membrane enclosing in their nucleus, hence they have  a true nucleus and organelles bound by a membrane, supporting functions in compartments. Prokayotic cells or prokayotes, on the other hand, which are typically smaller, do not possess a protective membrane around their nucleus or any organelles enclosed by the membrane. Regardless of their differences, they still both share similarities. After all, they both are cells. So they have the basic features of cells. These similarities include the possession of a cytoplasm, ribosomes, plasma membrane.

7 0
2 years ago
What is the effort put by scientists and sailors to know about earth?​
sergey [27]

Answer:

The effort put by scientist and sailors about earth is that they keep on going round the earth and putting their lives in danger and some even give their lives.

Explanation:

......

6 0
1 year ago
Read 2 more answers
A (n) inhibitor has a structure that is so similar to the substrate that it can bond to the enzyme just like the substrate. 2. a
Studentka2010 [4]
The answers are as follows:
1. <span>An inhibitor has a structure that is so similar to the substrate that it can bond to the enzyme just like the substrate: t</span>his is called competitive inhibitor. A competitive inhibitor will compete with the substrate for the active site of the enzyme and bind to the active site, thus incapacitating the substrate from binding to the active site.
2.  An inhibitor binds to a site on the enzyme that is not the active site: this is called non competitive inhibitors. Non competitive inhibitors bind to other site in the enzyme which is not the active site of the enzyme. The binding of the inhibitor changes the conformation of the enzyme as well as the active site, thus making it impossible for the substrate to bind to the enzyme effectively.
3. <span>usually, a(n) inhibitor forms a covalent bond with an amino acid side group within the active site, which prevents the substrate from entering the active site or prevents catalytic activity: this is called irreversible or permanent inhibition. Permanent inhibitors form covalent bonds with the enzyme and prevent substrate from binding to the enzyme.
4. T</span><span>he competitive inhibitor competes with the substrate for the ACTIVE SITE on the enzyme: The active site of an enzyme is the place where the substrate normally bind in order to activate a enzyme. Competitive inhibitors are those inhibitors that compete with the substrate for the active site of the enzyme and prevent the substrate from binding there.
5. W</span><span>hen the noncompetitive inhibitor is bonded to the enzyme, the shape of the ENZYME is distorted. The non competitive inhibitors are those inhibitors that bind to other places in the enzyme instead of the active site. The binding of the non competitive inhibitor usually distort the shape and the conformation of the enzyme thus preventing the substrate from binding to it effectively.
6. E</span><span>nzyme inhibitors disrupt normal interactions between an enzyme and its SUBSTRATE. The principal function of enzyme inhibitor is to prevent the substrate from binding to the appropriate enzyme. This is usually done in the human system in order to regulate the activities of enzymes.</span>
6 0
2 years ago
Species 1 is described as 2n = 8 and has chromosome composition BBDDEEHH.
egoroff_w [7]

Answer:

a. Trisomic

Explanation:

A trisomy is a genomic phenomenon whereby a particular chromosome is present in three copies. In this case, the trisomy involves the chromosome P, being this species a tetraploid with 5 pairs of homologous chromosomes (2n = 10). In humans, the trisomy for chromosome 21 is one of the most common types of aneuploidies that lead to the Down syndrome by producing alterations in gene expression patterns that are associated with changes in the phenotype

7 0
2 years ago
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