All categories

3 years ago

In what shape does blood fall? A) square B) tear drop C) spherical D) elliptical

Biology

2 answers:

nlexa [21]3 years ago

5 0

Answer:

In what shape does blood fall?

Blood forms a spherical shape (perfect circular shape) almost immediately upon separating from the blood source. The spherical shape is caused by the surface tension of the blood. Surface Tension causes the blood drop to pull itself in; both horizontally and vertically.

Explanation:

jeyben [28]3 years ago

5 0

Spherical ... Blood forms a spherical shape (perfect circular shape) almost immediately upon separating from the blood source. The spherical shape is caused by the surface tension of the blood. Surface Tension causes the blood drop to pull itself in; both horizontally and vertically.

You might be interested in

Which of the following does NOT

Kazeer [188]

Answer:

D. Lots of vegetation

Explanation:

Urban heat islands form when cities replace natural land cover with dense concentrations of heat-absorbing pavement, buildings, and other surfaces. This has the impact of raising energy prices (for example, air conditioning), air pollution levels, and heat-related sickness and mortality.

8 0

2 years ago

Read 2 more answers

You are dealing with a problem in which the male parent has a genotype of DDmm, while the female parent has DdMm. After doing th

erastova [34]

The sets of alleles for each parent are Dm for the mother and DM, Dm, dM, and dm for the father. This information is fundamental for estimating genotype and allele frequencies in offspring.

<h3>What are alleles?</h3>

Alleles are gene variants for a given gene locus, diploid organisms inherit two alleles for each locus (one from each parent).

Gametes are germinal (haploid) cells that carry specific allele combinations.

The analysis of gamete combinations is fundamental to estimate genotypes and allele frequencies.

Learn more about alleles here:

brainly.com/question/3452155

6 0

2 years ago

How do temperature and concentration of monounsaturated phospholipids change the rate at which molecules permeate the plasma mem

Nikitich [7]

Answer: At low temperatures the fluidity of the membrane decreases and it favors fluidity. The higher the concentration of unsaturated fatty acids, the less tightly the phospholipids can bind and the more fluid (more permeable).

Explanation:

The plasma membrane is a lipid layer that delimits the entire cell, dividing the extracellular medium from the intracellular (the cytoplasm of a cell). They are composed of phospholipids, which are molecules composed of glycerol, a phosphate group and two lipid chains (such as fatty acids). Glycerol is a three-carbon molecule that functions as the backbone of this membrane. A geometry is formed that allows the phospholipids to line up side by side to form broad sheets. They are insoluble in water, but their unique geometry causes them to aggregate in layers without any energy input, as they possess a hydrophilic phosphate head and a hydrophobic tail consisting of the two fatty acid chains. The hydrophilic heads of the phospholipids in a bilayer membrane face outward and are in contact with the aqueous fluid inside and outside the cell. Because water is a polar molecule, it readily forms electrostatic (charge-based) interactions with the phospholipid heads.

Selective permeability is a property of the plasma membrane and other semipermeable membranes that allow only certain particles to pass through them. In this way, those particles that are needed by the cell can enter the cell and those that are not useful to the cell are prevented from entering. In the same way, the cell can eliminate the particles it has produced as waste. In this way, the entry and exit of substances through the membrane is regulated and the correct functioning of the cell is achieved.

For a particle to be able to cross the plasma membrane it must have a size equal to or smaller than the pores of the membrane, it must have the opposite charge to the charge of the membrane or simply have a neutral charge, and if it is larger than the pores it must be dissolved in a solution, decreasing its size and thus be able to enter the cell through the membrane.

Plasma membranes are fluid and this fluidity depends on their lipid composition and temperature. Depending on the temperature, membrane lipids can be found in two different states or phases: gel (solid-like, with more rigid hydrocarbon chains) and liquid crystal (more fluid, with more mobile hydrocarbon chains). At low temperatures the fluidity of the membrane decreases and in these conditions the increase of its concentration favors fluidity. The temperature at which the transition from one state to the other occurs is the phase transition temperature (Tc). At values below Tc, the bilayer is in the gel state and at higher values it passes to the liquid crystal. It should be noted that there is an equilibrium between the gel state and the liquid crystal state and that the characteristics of the lipids of the bilayer condition the transition temperature. In the case of bilayers consisting of only one type of lipid, the Tc is well defined. But biological membranes are complex lipid mixtures and the transition from one state to another occurs over a range of temperatures. The presence of short-chain or unsaturated fatty acids reduces the transition temperature, while saturated fatty acids and the increase in the length of the hydrocarbon chains cause this temperature to rise. Then, phospholipids with unsaturated fatty acid tails cannot bind as tightly due to the bent structure of their tails. For this reason, a membrane of unsaturated phospholipids remains fluid at lower temperatures than a membrane of saturated phospholipids.

The fluidity of a membrane is the ability of a molecule to move through it. In short, the higher the concentration of unsaturated fatty acids, the less tightly the phospholipids can bind and the more fluid (more permeable) the membrane will be even at low temperatures. However, at low temperatures the fluidity of the membrane decreases (lower permeability) but the effect will depend on the composition of the fatty acids. To determine the exact permeability, it is necessary to relate the concentration of unsaturated bonds and the length of the fatty acids in the phospholipids and the temperature.

8 0

3 years ago

Which best describes a disadvantage of this scenario?

Andre45 [30]

Answer:

Which best describes a disadvantage of this scenario?

Scientists have cloned goats so they can take out a

protein in the goats' milk and use it to make medicine.

The goats are raised in a laboratory. The medicine that

is produced can help with certain diseases that affect

humans.

O The goats will have more genetic variation

O The goats will become infected with the human

diseases.

There are unknown health risks to the goats.

O There could be many health risks to drinking the

goats' milkWhich best describes a disadvantage of this scenario?

Scientists have cloned goats so they can take out a

protein in the goats' milk and use it to make medicine.

The goats are raised in a laboratory. The medicine that

is produced can help with certain diseases that affect

humans.

O The goats will have more genetic variation

O The goats will become infected with the human

diseases.

There are unknown health risks to the goats.

O There could be many health risks to drinking the

goats' milkWhich best describes a disadvantage of this scenario?

Scientists have cloned goats so they can take out a

protein in the goats' milk and use it to make medicine.

The goats are raised in a laboratory. The medicine that

is produced can help with certain diseases that affect

humans.

O The goats will have more genetic variation

O The goats will become infected with the human

diseases.

There are unknown health risks to the goats.

O There could be many health risks to drinking the

goats' milk

Explanation:

8 0

3 years ago

These statements describe three different reactions.

Arte-miy333 [17]

Answer: 2 - The nucleus of an atom is split apart

Explanation: Any reaction involving the nucleus of an atom is called a nuclear reaction. It is different from ordinary chemical reactions that involve electrons because it involves the release of large amount of energy. Nuclear reactions can be classified as nuclear fission and nuclear fusion.

A nuclear reaction in which a nucleus of an atom is split into two smaller atoms with a release of large amount of energy is called nuclear fission. A nuclear reaction that involves the combination of lighter nuclei of elements to form heavier atoms that are more stable with the release of a large quantity of energy is called nuclear fusion.

5 0

3 years ago