PLEASE HELP STUCK ON TEST QUESTION !!!
The main lesson farmers learned from the Dust Bowl in the 1930s was to _?_.
A) plant one crop repeatedly in order to make a profit
B) use the topsoil until it is no longer productive, then move to a new area
C) conserve and protect the topsoil so it will be productive for years

Answer:

The molecules in the water spread apart. The molecules in the thermometer's liquid spread apart. When a thermometer was placed in water to measure the water’s temperature. the molecules in the thermometer liquid which is often mercury spreads apart and rises, this shows a temperature increase in the thermometer.

Answer:

In mitosis, the results are 2 different diploid cells.

Explanation:

Mitosis is an exact replication of the parent cells, making them diploid cells. 4 haploid cells are the result of meiosis.

Answer:

When a haploid cell undergoes mitosis, it produces two genetically identical haploid daughter cells; when a diploid cell undergoes mitosis, it produces two genetically identical diploid daughter cells. ... In contrast, meiosis is considered a “reductional” form of cell division that occurs in diploid germ cells.

Answer:

Central banks control and manipulate the national money supply: issuing currency and setting interest rates on loans and bonds.

Explanation:

To ensure a nation's economy remains healthy, its central bank regulates the amount of money in circulation. Influencing interest rates, printing money, and setting bank reserve requirements are all tools central banks use to control the money supply.

Answer:

Frecuencia 20 respiraciones / min

Explanation:

Explanation:

lakes is large in its wide and stagnant water from different water bodies like river, wetlands

Anaerobic respiration of yeast produces ethanol and carbon dioxide, which can be experimentally tested by determining the rate of CO2 production in a closed system.

Anaerobic respiration is a series of chemical reactions by which certain organisms can produce energy (ATP) in absence of oxygen.

Anaerobic respiration is useful in experimental settings to determine the survival rate of yeast, which can be determined by measuring the concentration of products of this process.

The experimental procedure requires the use of a closed system to determine the rate of change between reactants (glucose) and products (ethanol + carbon dioxide).

In conclusion, Anaerobic respiration can be experimentally tested by determining the rate of CO2 production.

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Answer:

The correct answer is - chromatin.

Explanation:

Chromatin is a part within a chromosome consisting of DNA and protein. The DNA carries the cell's genetic instructions and these are complex structures present in multiple linear chromosomes.

The major proteins in chromatin are histones, which help package the DNA in a compact form that fits in the cell nucleus.

You are right with your answer please

Actual Question:
Which statement about the purpose of the field of science is false? (1 point)

Science is used to investigate the natural world.

Events of the natural world can be explained by science.

Science works to establish a collection of unchanging truths.

Useful predictions come from derived explanations of science.
Answer:

Science works to establish a collection of unchanging truths.

Explanation:

I took the test

Answer:

Las principales aplicaciones del electromagnetismo se emplean en: La electricidad. El magnetismo. La conductividad eléctrica y superconductividad.

Explanation:

Answer:

Rhea from south america

Emu from Australia

ostrich in Africa

Answer:

Mechanisms of enhanced transcapillary filtration in response to elevations in arterial or venous pressure. Elevations in arterial (Pa) or venous (Pv) pressure increase capillary pressure, which favors enhanced capillary filtration (Jv).

option"c"

Answer:

True

Short Answer-Denitrifying bacteria transform nitrate in extremely wet soils and swampy grounds where there is very little oxygen, i.e. the conditions are anaerobic. The bacteria get the oxygen they need for respiration from the breakdown of nitrates.

Explanation:

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Answer:

b

Explanation:

a predator is a bear that kills and eats fish

Answer:

B. bear that kills and eat fish

Answer:

Yes it does

Explanation:

Answer:

In Gregor Mendel's work with pea plants, he found that when a tall pea plant, with genes TT, was crossed with a short pea plant, with genes tt, that _100_ % of the first generation of offspring plants were tall pea plant_.

Explanation:

After crossing the two types of plants, Mendel observed that among the F1 there were only tall variants, while the other variant (short) disappeared. Mendel named "dominant" the expressed variant. Mendel then let these new plants auto pollinate and observed the results in the second generation, F2. He saw that the short variant that had previously disappeared, reappeared again. Both tall and short plants were present in the F2. Mendel named "recessive" the second alternative variant.

Mendel explained his results by arguing that discrete factors were responsible for these phenotypes. These factors should have been present in the F1 in pairs. One of them came from one parental plant, and the other factor came from the other plant. These factors then separated again when sex cells were produced, giving two types of gametes, each with only one factor.

Mendel concluded that each plant had a pair of factors -which he named alleles-, and that each factor coded for one trait -tall and short-. He thought that these factors -T and t- separate -segregate- during gamete formation. This conclusion is known as the segregation principle (First Mendels´ Low).

Answer: White colonies that are resistant to ampicillin.

Explanation:

The lac operon is an operon required for the metabolism of lactose in enteric bacteria such as Escherichia coli . It has three structural genes, a promoter, an operator and a regulator, all regulated by the availability of glucose and lactose. The lac repressor, a protein, senses lactose and blocks transcription of this operon. It acts as a repressor when lactose is present. A catabolite-activating protein (CAP), on the other hand, acts as a glucose sensor. The bacterium should express the lac operon only when lactose is available and glucose is not available. Thus, genes can always be transcribed, except when the Lac repressor protein is bound to the operon region, for which it has a high affinity (i.e. in the absence of lactose), where the Lac repressor protein maintains its high affinity for the operon region, preventing RNA polymerase from transcribing the structural genes. Thus, the system remains closed with consequent energy savings for the bacterium. In the presence of lactose, it binds to the Lac repressor protein and generates a conformational change that decreases its affinity for the operator region. Thus, the operator region is left free, RNA polymerase can freely transcribe the structural genes and the synthesized β-galactosidase (an enzyme) can degrade lactose to glucose plus galactose for energy.  

Thus, the lac z gene encodes the enzyme β-galactosidase, which catalyzes the hydrolysis reaction of lactose to glucose and galactose. In gene cloning experiments, a compound called X-gal is used as an indicator of cells expressing the β-galactosidase enzyme. X-gal is hydrolyzed by the enzyme to galactose and another compound that is oxidized giving an insoluble blue compound. Thus, if X-gal and a β-galactosidase inducer are dissolved in the medium of a culture plate where the transformed bacteria is found, colonies grown on the plate that possess a functional lac z gene (either because they were not transformed by the plasmid, or if they were but the plasmid does not have the cloned fragment or gene that disrupts the lac z gene) can be clearly distinguished by their blue coloration. If they have another gene inserted interrupting the lac z gene, they will not be able to produce the enzyme that degrades X-gal, resulting in white colonies since X-gal is not degraded giving that characteristic blue color.

The white, non-transforming colonies are eliminated by adding an antibiotic to the medium for which the plasmid provides resistance (in this case ampicillin), so that we can select the recombinant colonies that carry the vector with our sequence, simply by their color.

So, if bacteria are transformed with a plasmid (with ampicillin resistance) cloned with a gene that interrupts the lac z gene, the bacteria will be white because they do not synthesize the enzyme that degrades X-gal and will be resistant to ampicillin.

Answer:

I hope it helps you

I think b is the answer

Answer:

The first option would be the best.

Explanation:

The oceans heat up first before the atmosphere does.

Biology is the branch of science.

Human biology is the branch of biology that focuses on human beings and human population.

Social biology is the branch of biology that is the study of social behaviour of animal and human.

Answer:

Biology is the study of living things.

Social biology studies human and animal behaviour.

:):):):):):):):):):):):):):):):):):):):):):):)

Explanation:

C) Coronary artery disease can reduce blood flow to the heart and cause heart attacks

CAD (or atherosclerosis) affects the vessels that supply blood to the heart muscle. It is caused by deposits of calcium, fat, cholesterol and fibrous tissues, which makes the lumen of arteries narrower. And due to inadequate supply of blood, the heart muscles get damaged. This can lead to a heart attack!

Answer:

The correct answer is - Gene 1 and 14.5 (or 14).

Explanation:

The cycle threshold is denoted as Ct value. It is the cross point at the threshold line meets with fluorescence signal reaction curve. In the given RTpcr experiment, the threshold line is fluorescence intensity 1 thus, Ct value for each gene will be the point at which each curve meets the fluorescence intensity line at 1. Ct value of is inversely proportional to amount of nucleic acid in the given sample.

Here, the Ct for gene 1 is the lowest, so the amount of DNA would be highest.

Gene with highest expression= Gene 1

Ct value= 14.5

Answer:

it should be G-G-A-G-C-T-A-A-G-T-G-C

Explanation:

A=T

C=G

think of them as opposites. invert them and you'll have the answer (its easier if you write the answer right underneath)

The amino acid sequence should be G-G-A-G-C-T-A-A-G-T-G-C

G-G-A: glycine

G-C-T: alanine

A-A-G: lysine

T-G-C:  tyrosine

Amino acids are molecules that combine to form proteins. Amino acids and proteins are the building blocks of life.

The nucleotide triplet that encodes an amino acid is called a codon. Each group of three nucleotides encodes one amino acid. There are 64 combinations of 4 nucleotides taken three at a time and only 20 amino acids, the code is degenerate (more than one codon per amino acid, in most cases).

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answer : biosphere

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Answer:

The highest level of organization for living things is the biosphere; it encompasses all other levels. The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.

Answer:

biosphere

The highest level of organization for living things is the biosphere; it encompasses all other levels. The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.

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Answer:

The correct answer is -

- transverse cutaneous nerve

- cervical plexus

Explanation:

transverse cutaneous nerve is infected by the virus that causes skin vesicles on the anterolateral region of her neck. It belongs to the cervical peripheral nerve plexus.

Answer:

interphase and the mitotic (M) phase.

Explanation:

The stages of the cell cycle are divided into two major phases: interphase and the mitotic (M) phase.

Answer:

The interphase & the miotic phase

Explanation:

Answer:

nearsightedness, or blurred vision when looking at faraway objects cataracts, or clouding of the eye's lens retinitis pigmentosa

Explanation:

Answer:

Psychasthenia is a neurotic state characterized especially by phobias, obsessions, or compulsions that one knows are irrational.

Answer:

Answer:

It's a laboratory technique used to establish a link between biological evidence and a suspect in Criminal investigation. It's also known as genetic fingerprinting.