BIOLOGY COLLEGE

PCR makes it possible to ____________ the tiniest amount of DNA from crime scenes.

Answers

Answer 1
Answer:

Answer:

PCR makes it possible to sequence the tiniest amount of DNA from crime scenes.

Explanation:

PCR is a process where regions of DNA are amplified to create lots of copies of the DNA. This creates enough material for the lab assistants to be able to analyze the DNA, including sequencing, gel electrophoresis, and other techniques.

This is helpful in crime scenes, where sometimes there are very small amounts of DNA that need to be analyzed.

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Cells responsible for histamine release

Answers

Answer:

Mast Cells

Explanation:

Mast cells release histamine in the blood stream, when they detect a substance that triggers an allergic reaction, also called an allergen.

the five-carbon carbohydrate that combines with CO2 in the first step of the calvin-benson cycle is called _____

Answers

The five-carbon carbohydrate that combines with CO2 in the first step of the Calvin-Benson cycle is called "ribulose-1,5-bisphosphate" or "RuBP" for short.
ribulose-1,5-bisphosphate (RuBP).

In a 10 m2 ecosystem, there are 60 raccoons. What is the population density of raccoons?

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the answer is 6 raccons per square meter

Which type of malnutrition is characterized by a swollen belly due to the accumulation of fluid in the abdomen?

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The answer is kwashiorkor. Kwashiorkor, also known as “edematous malnutrition” because of its relationship with edema is a nutritional disorder most often seen in regions experiencing famine. It is a form of malnutrition caused by an absence of protein in the diet. 

Forests dominated by gymnosperms tend to have mechanisms to allow it to regenerate after a fire. As a consequence this type of forest ______________.a. dominate areas where the U.S Forest Service does not put out fires.
b. only lives 20-30 years
c. is dominated by trees of a single age
d. has no overstory species

Answers

Answer:

Forests dominated by gymnosperms tend to have mechanisms to allow it to regenerate after a fire. As a consequence this type of forest is dominated by trees of single age .

Explanation:

  • It is possible to conclude the question given above in many ways. After a forest fire in a specific forest patch occurs, the impacts are determined by the severity of the fire and the type of forest in which the occurrence occurs. Usually, the dramatic effect on the trees and plants that can be seen in that region can be seen after such an occurrence has occurred. In certain situations, the situation can also worsen, leading to the destruction of the entire cover, if the circumstances favor the propagation of fires. In such cases, the removal of the prevailing structure can lead to the formation of a new forest structure through a mechanism called 'succession,' in which there is a sequence of progression in a biologically acceptable manner through the growth of different plant species. Simply put, the new plants will attempt to adapt or acclimatize to the conditions introduced after forest fire in such a way that this will later provide the route for the growth of plants and trees that can not easily accommodate in the harsh conditions. Therefore, instead of the forest surviving for a short period of time following a forest fire occurrence, there would be changes in the nature of the forest. This suggests that option 'B' is not the response that is most suitable.
  • Choice 'A' appears to be logically inaccurate, taking into account that if they are of high intensity, fires may be uncontrollable. In addition, there is no clear mention of the fire's region of origin and which trees are most affected. Typically, gymnosperms illustrate a simple process in which they can not limit their destruction from the flames, while they can provide a way for their progeny to initiate next generation development in the form of seed. This occurs in the case of Gymnosperms in which, under ordinary conditions, the seeds of the plants are enclosed within a cone that is restricted from germinating. Although the fires pave the way for the seeds to germinate under certain fire conditions, which in turn leads to the emergence of the next generation of gymnosperms, and several studies indicate that these newly introduced seeds would have the same age as choice 'C' indicated. But, as this is not under the jurisdiction of the US Forest Service, legally, option 'A' tends to be wrong. At the same time, it can be seen that forest fires are not consistent in their coverage in certain cases, and thus the chances of dispersal and germination tend to be not even and thus choice 'C' can be reported to be either correct or incorrect in all possible ways.
  • But, first, it is important to know what an overstory is for the option 'D'. A forest consists of trees of all sizes, from the smallest to the tallest pine trees. The uppermost element that is directly in contact with the light from the sun is the overstory. The manner in which the degree of overstory damage occurs depends on the moisture content of the trees and the other associated conditions around the trees. Taking this into account, a forest fire may either lead to the loss of an entire overstory or can have impacts that are confined to plants and trees at the ground level. So, even the 'D' option can be right or inappropriate. But, therefore, choice 'C' should be the most suitable response, taking into account that most studies indicate growth of single-age trees due to germination mediated in the presence of fire. This seems to be scientifically right for a small patch where there was also fire-mediated damage. Accordingly, the most suitable response should be option 'C'.

Hence , the correct option is C.

17. Which of the following statements is/are correct? A. Leeches are members of the phylum Platyhelminthes
B. All platyhelminthes are parasites of other organisms.
C. Most, if not all, Platyhelminthes lack a coelom.
D. Given the following on the organism:
I. An animal
II. Multicellular
III. has tissues (diploblastic)
IV. Lacks a digestive tract
V. is asymmetrical
This organism could be a member of the Phylum Platyhelminthes
E. Platyhelminthes can not reproduce sexually

Answers

Answer:

The options B, C, D and E are correct

B. More of organisms in the phylum platyhelminthes are parasitic in nature.

C. Platyhelminthes are acoelomates and therefore lacks coelom.

D. Phylum Platyhelminthes organisms are multicellular, asymmetrical, lack a digestive tract and are advanced diploblastic.

E. Most Platyhelminthes are hermaphrodites possessing the male and female sex organs.

Option A is wrong because:

A. Leeches are in the Phylum Annelida and are segmented in nature.

They are advanced

As a result of this characteristic, they are able to reproduce asexually and sexually

Answer:A

Explanation:
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