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1 year ago

1. Which word best describes a scientific hypothesis? a. provable b. theoretical c. testable d. quantifiable

Biology

2 answers:

Masja [62]1 year ago

7 0

C. Testable. A hypothesis should always be testible

Mekhanik [1.2K]1 year ago

3 0

You have to remember that a scientific hypothesis is a question about whether or not something will happen the way you think it will.

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3._____ If you investigated cells from a lab mouse with 40 chromosomes you would find a total of ___ sister chromatids after the

yulyashka [42]

The answer is 10;G1” Write that

4 0

1 year ago

. Pepper colors range from bright red, orange, and yellow shades, to dark green and brown shades. Coloration in bell peppers is

sattari [20]

Answer:

All crosses and proportions, genotypes and phenotypes are attached.

Explanation:

a. Within living organisms, staining is a characteristic governed by a polygenic inheritance, which means that there is more than one gene involved in the staining process. as you already know, each gene has two alleles, if a trait is controlled by 2 genes, it means that we will have 4 alleles at the crosses.

From the description between dominance and recessivity between the alleles that control the colors of the pepper, shown in the question above, we can see that for the crossing between a red pepper and a green pepper, being able to generate a completely orange offspring, it would be necessary that the genotype of the parent peppers was: Red: RGRG, green: rgrg.

This would generate an orange-colored RrGg offspring, as you can see at the F1 crossing.

b. When individuals of F1 offspring are crossed, the combination of alleles and the determination of genotypes and phenotypes becomes much more complex, because instead of 4 alleles, we will have the combination of 16 alleles among themselves. Once again we will need to rely on the description of dominance and recessivity shown in the question above, so that from the crossing between the alleles of each gene, we can reach a conclusion, as you can see in the F2 crossing.

4 0

1 year ago

A cell is in a equilibrium with its surrounding at 30 degrees Celsius. The molarity of surrounding sucrose solution is 0.5m. Cal

Travka [436]

Solute potential of a solution is calculated using the formula,

Ψ $_{s}=-(iCRT)$

Where,

Ψ $_{s}$ is the solute potential of the solution,

<em>i</em> is the degree to which the solute ionizes(ionization constant) in solution = 1, as sucrose is a nonelectrolyte.

C is the concentration of the solution in molarity = 0.5 M

R is the gas constant or the pressure constant = 0.0831 L.bar/(mol.K)

T is the temperature in Kelvin scale = $30^{0}+273 =303 K$

Calculating the solute potential of the surrounding sucrose solution:

Ψ $_{s}=-(iCRT)$

= -(1 * 0.5 M * (0.0831 L.bar/(mol.K))* 303 K)

= 12.6 bar

Therefore, the solute potential of the surrounding solution is 12.6 bar

7 0

1 year ago

Which statement about DNA replication is FALSE?

Alexandra [31]

Answer:

C. DNA ligase adds nucleotides to the lagging strand

Explanation:

DNA replication is the process during cell division in which DNA copies itself. DNA strands unwind with the help of helicase to initiate the process. DNA Polymerase III is responsible for prokaryotic replication and adds nucleotides in 5' to 3' direction. Since both the strands of DNA run in opposite direction their replication is slightly different. The lagging strand is also formed by DNA Polymerase III in discontinuous manner leading to formation of Okazaki fragments. DNA ligase joins these fragments once the replication process is completed.

5 0

2 years ago

Mr. Helms was admitted to the hospital with chest pains and shortness of breath. His wife was panicked since her 72-year-old hus

Lynna [10]

Answer:

Explanation:

1- the purpose of blood flow-circulatory system- is to convey Oxygenated blood, oxygen bonded with haemoglobin in the RBC with Nutrients - and distributed these through the arteries and capillaries away from the heart, to reach the cells and tissues, and transported the wastes of theses cells and tissues , with C02 through the veins back to the heart and the kidney.

2. During diastole,deoxygented blood from the inferior and superior vena cavae entering the R.atrium, passes through the tricuspid valve into the Right Ventricle. Simultaneously, oxygenated blood returning through the pulmonary veins enters the left Atrium,emptied through the bicuspid valve into the Left.Ventricle.

During systole, the two ventricles contracts. The Right ventricle contracts, the pressure of the blood forces the tricuspid valve to close,and therefore de -oxygenated blood pushes the pulmonary valves to open and blood passes through the pulmonary artery to reach the lungs where exchanges of oxygen with carbon dioxide occurs.The blood is now oxygenated and returns to the left atrium via pulmonary veins.

Simultaneously, the left ventricle contracts,the oxygenated blood it contains forced the bicuspid valve to close so that blood is forced through the aortic valve to empty into the aorta into the systemic circulation,branches of the carotid artery supplies the heart from the aorta.

The Whole cycle continues.

8 0

2 years ago