Radioactive contamination can enter the body only through absorption. a. True b. False

1 answer:

5 0

I believe the correct answer is false. Radioactive contamination can inter via absorption. However, it is not only limited to such process. It can also go into the body by injection, inhalation and ingestion. All of these methods would lead to committed dose.

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A scientist helps a colleague do a better experiment by:

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Answer:

B. Offering advice about how best to perform a standard procedure.

Explanation:

Helping others can be in different ways, be it helping out or by giving encouraging words or advice. But in all aspects of help, there is always a positive outcome if help is given in the right way and at the right time. And it is also how one person lifts another.

A scientist can help a colleague out by offering advice and telling the person how to best perform a standard procedure. This will help the colleague do better in the experiment and also help ensure that the right things are done and the efforts are successful. The other options are all negative in their 'approach' which will only hinder the colleague in his/her works.

Thus, the correct answer is option B.

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Some of the lipid groups appear similar, but changing a few components significantly alters their biological properties. identif

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Both glycerophospholipids and sphingolipid structures are asymmetrically distributed in the two layers of the phospholipid bilayer. Sphingolipids are membrane lipids that have a ceramide backbone while glycerophospholipid has glycerol present in its membrane lipids. Sphingolipids may or may not be present.

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When magma or melt solidifies it formsrocks. If a pre-existing rock is exposed to extreme heat or pressure its physical properti

Naily [24]

Answer:

When magma solidifies it forms igneous rocks. If a pre-existing rock is exposed to extreme heat or pressure its physical properties can change, forming a metamorphic rock. Rocks derived from the weathered grains of other pre-existing rocks through lithification are sedimentary rocks.

Explanation:

The naturally occurring structure that is formed on the Earth's crust and is composed of a single mineral or an aggregate of several minerals is known as a rock. The classification of rocks on the basis of their formation is igneous rocks, sedimentary rocks, and metamorphic rocks.

Igneous rocks: They are formed by the slow or rapid cooling and then solidification of molten magma on the Earth's crust or seabed. The two types of igneous rocks are intrusive igneous rocks, which contain large crystals formed by the slow cooling of magma below the Earth's surface (granite, gabbro, diorite, pegmatite, etc) and extrusive igneous rocks, which contain small crystals formed by the fast cooling of magma that reached on the Earth's surface (basalt, obsidian, pumice, tuff, etc).

Sedimentary rocks: They are formed by the accumulation and lithification (compaction and cementation of accumulated sediments) of sediments created from the weathering of existing rocks or fragments of minerals and organisms over time. The different types of sedimentary rocks are clastic sedimentary rocks, which are formed from the fragments of other weathering rocks (conglomerate, sandstone, mudstone, siltstone, etc), chemical sedimentary rocks, formed from the dissolved materials precipitated from solution (rock salt, oolitic limestone, gypsum, etc) and organic sedimentary rocks, created from the accumulation of debris formed from plants or animals (limestones, coal, dolomites, etc).

Metamorphic rocks: They are transformed rocks formed from the existing rocks that are subjected to large pressures (regional or dynamic metamorphism) and temperatures (contact or thermal metamorphism). The basic types of metamorphic rocks are foliated metamorphic rocks that have a layered or banded appearance (gneiss, schist, etc) and non-foliated metamorphic rocks that do not have a layered (quartzite, hornfels, marble, etc).

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3 years ago

Process of asexual and sexual reproductions of a Hammerhead Shark

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Answer:

A hammerhead shark that gave birth in a Nebraska aquarium reproduced without mating, a genetic analysis shows. This form of asexual reproduction, called parthenogenesis, has been found in other vertebrate species, including some snakes and lizards. But this is the first time it has been documented in a shark.

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The __________________ pulp of the spleen contains lymphocytes and serves to fight pathogens, whereas the __________________ pul

STatiana [176]

Answer:

The given blanks can be filled with white pulp and red pulp.

Explanation:

In the lymphatic system, the spleen is considered as the largest organ. It is situated in the upper left part of the abdominal cavity, the main function of the spleen is to filter blood containing the destructed cells, pathogens like viruses and bacteria, and cellular debris.

The spleen generates and develops the mature immune cells, which possess the tendency of finding and eliminating the pathogens. The white pulp of the spleen comprises the immune cells, that is, the B and T lymphocytes, which help in fighting against the pathogens.

On the other hand, the red pulp of the spleen comprises connective tissue called the cords of Billroth, and various splenic sinusoids, which are filled with blood, providing it a red appearance. Its main function is to filter the blood containing microbes, pathogens, and worn-out or the defective RBCs.

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