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3 years ago

Define diffusion and osmosis

2 answers:

7 0

Diffusion is the movement of substances from high to low concentration

osmosis is the diffusion of water through a semipermeable membrane from high to low water concentration

Morgarella [4.7K]3 years ago

6 0

Answer:

Explanation:

spontaneous movement of a substance from a region of high concentration to a region of low concentration is called DIFFUSION

Passage of water from a region of high water concentration through a selectively permeable membrane to a region of low water concentration is called osmosis.

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Which hormone is NOT released by the pituitary gland?

Vladimir79 [104]

The hypothalamus sends signals to the pituary glands. The hypothalamus releases dopamine, so I think dopamine is a good answer?

5 0

3 years ago

What is the role of the gizzard in bird digestion?

viktelen [127]

The correct answer is C. To store gastroliths that physically grind up food.

Explanation

The gizzards, are a special part of the digestive system of some animals such as birds, fish, and reptiles whose main function is to crush the food that the animal ingests, for this task, the gizzards contain in their interior gastroliths, a kind of polished stones, that grinds the food that the animal eats. The gizzards represent an important part for these animals because many of them do not have teeth to crush their food and feed on it. So, the correct answer is C. To store gastroliths that physically grind up food.

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3 years ago

Which scenario best describes motion?

grin007 [14]

Answer:

c. a ball rolling from point A to point B

Explanation:

a is talking about the position of the train

b is talking about the length of the track

d is talking about the distance a student is from somewhere.

So from taking all these options out we are left with C because the ball is actually moving and when something moves it is in motion.

4 0

2 years ago

What are the 5 kingdom of animals?Provide 2 example of each kingdom?

Kryger [21]

Answer:

Living organisms are divided into five kingdoms:

Prokaryotae

Protoctista

Fungi

Plantae

Animalia

Prokaryotae

Unicellular and Microscopic.

Non-membrane bound (no nuclear membrane, no ER, no mitochondia).

Cell wall made of murein.

Examples: Bacteria or Cyanobacteria (photosynthesising bacteria).

Protoctista

Mainly small eukaryotic organisms.

Many live in aquatic environments.

This is usually the kingdom where organisms which aren’t animals, plants or fungi go.

Examples: Algae, slime moulds and the malaria causing Plasmodium.

Fungi

Eukaryotic

Multicellular

Cell wall made of chitin.

The members of this kingdom don’t possess photosynthetic pigments and are therefore heterotrophic.

Examples: Mushroom, Mold, Puffball

Plantae

Eukaryotic

Multicellular

Cell wall made of cellulose.

Members of the plantae group contain photosynthetic pigment and gain their energy through it and are therefore autotrophic.

Animalia

Eukaryotic

Multicellular

Heterotropic

The members of this kingdom can be split into two groups, vertebrates and invertebrates. The diagram below shows the different subsections of the animalia

4 0

3 years ago

Three human disorders−−fragile X syndrome, myotonic dystrophy, and Huntington's disease−−are conceptually linked by a common mod

Fed [463]

Answer:

The correct answer is ''All three are caused by disparate genes, but each gene was found to contain repeats of a unique trinucleotide sequence.''

Explanation:

Four groups of trinucleotide repeats related to DNA expansion have been characterized in the human genome. CGGI GCC, CAGIGTC, CTGIGAC and recently GW CTT sequences. The CGGl GCC sequences are usually located in the noncoding regions of different genes and when expanded they associate with fragile sites on the chromosomes. The CAGIGTC repeats are part of the coding region and are related to different neurodegenerative disorders. You can try to make a classification depending on the unit that is repeated, having on one side a group that are caused by repeats of the CAG trinucleotide (cytosine, adenine, guanine). Huntington's disease (HD) is a progressive disorder of motor, cognitive and psychic function. The disease is inherited in an autosomal dominant manner, and is caused by the expansion of CAG trinucleotide repeats in exon 1 of the gene called huntingtin (HTT or IT-15). Unstable mutations have also been found in which the repeat unit does not is composed of three nucleotides, if not four, such as type 2 myotonic dystrophy, where the tetranucleotide CCTG repeats. Fragile X Syndrome consists of an abnormal expansion of the cytosine-guanine-guanine trinucleotide (CGG) in the FMR1 gene, which prevents intellectual disability and also influences the formation of connective tissue

3 0

3 years ago