A cell biologist carefully measured the quantity of DNA in grasshopper cells growing in cell culture. Cells examined during the

Answer:

If immersion oil is not applied, the specimen will appear unclear and have low resolution.

Explanation:

To enhance image quality in microscopy, immersion oil is utilized. Its high refractive index aids in focusing light onto the specimen, which prevents light from dispersing away from it.

In scientific reasoning, a hypothesis is formulated prior to conducting relevant analysis. Conversely, a theory is built upon evidence: it serves as a comprehensive principle designed to elucidate concepts that are already grounded in established knowledge.<span>.

</span>For instance: “It’s bright outside.”
Hypothesis: A tentative explanation aimed at prompting further investigation.

Theory: A thoroughly validated explanation learned through methodology and verified through consistent observation and experimentation.

Answer:

18.38 × 10⁸.

Explanation:

Cell absorbance is directly proportional to their density

A\alpha cells/mL

A=K ×cells/mL ( Here, K is a constant)

Thus, A/ (cells/mL)=K

Hence, A1/( cells/mL)1=A2/ ( cells/mL)2

Where A1 represents initial absorbance, (cells/mL)1= initial concentration, (cells/mL)2= final concentration, A2= final absorption

Therefore, ( cells/mL)2=(A2* (cells/mL)1 ) / A1

= (1.25 × 5.75 ×10⁶)/1

= 7.18 ×10⁶.

Consequently, the final bacterial concentration in the culture with an absorbance of 1.25 =  7.18 ×10⁶.

Thus, after 8 generations

The growth of cells is geometric, meaning the cell count doubles with each generation, resulting in quadrupling the initial amount after the second generation.

The nth term of geometric progression is expressed as arⁿ⁻¹

where a is the first term, r =2 ( r=nth term/ (n-1) th term)

where n=9 ( n= number of generations+1)

The 9th term therefore becomes (7.18 ×10⁶ × 2⁸)

= 18.38 × 10⁸.

As a result, the number of cells in 1 mL after 8 generations is 18.38 × 10⁸.

Thus, the solution is 18.38 × 10⁸.

Since the diagram is not provided, let’s describe molecule movement along the cell membrane generally. Molecules may passively travel through the cell without energy, an example being oxygen molecules. However, larger and non-polar molecules struggle to cross the membrane easily. These particular molecules will need energy to be transported through the membrane and may do so with the aid of carrier or facilitated proteins, such as glucose molecules.