Lab midterm biol112

Are food and drinks permitted in the lab if kept away from chemicals?

No food or drinks are allowed in the lab to avoid contamination.

What is the dependent variable in an experiment measuring how long it takes enzymes to digest milk?

Digestion time, The dependent variable is the outcome measured, here the time taken to digest milk.

What happens to a plant cell in a hypertonic solution?

The cell shrinks, In a hypertonic solution, water leaves the plant cell, causing it to shrink.

Can oil immersion be used with any objective lens to increase magnification?

No, Oil immersion is only used with the 100x objective lens.

In the osmosis lab, which dialysis tube would gain more weight at 37°C?

The tube with 50% syrup concentration, Higher solute concentrations drive more water influx, increasing weight.

Which of the following correctly describes the steps for preparing a wet mount of cheek cells?

Swab cheek, smear on slide, add methylene blue, place cover slip, wipe excess dye. This ensures a clear sample for observation.

Which of the following is NOT allowed in the lab?

Eating a snack, Eating or drinking is prohibited in the lab to prevent contamination and ensure safety.

The ______ is the liquid in which solutes dissolve, and in biological systems, it is most commonly ______.

Solvent, water, Water is the primary solvent in biological systems.

Which of the following correctly identifies the nucleoid in a prokaryotic cell?

The region containing chromosomal DNA, The nucleoid is the region in prokaryotic cells where chromosomal DNA is condensed.

What should you wear when handling methylene blue to avoid staining?

Gloves prevent methylene blue from staining skin and clothes.

Diffusion is a ______ process driven by a ______ gradient.

Passive, concentration, Diffusion is passive and driven by a concentration gradient.

Which bacterial shape is rod-like?

Bacillus refers to rod-shaped bacteria.

Why were dialysis tubes used in the osmosis lab?

They mimic a cell membrane, allowing study of osmosis across a semipermeable membrane., his models cellular osmosis effectively.

Which structure is unique to plant cells?

Chloroplast, Chloroplasts are unique to plant cells for photosynthesis.

Which of the following is a difference between plant and animal cells?

Plant cells have a cell wall and chloroplasts; animal cells do not.

Which structure is a key component of an animal cell?

Lysosomes are membrane-bound organelles found in animal cells.

Which of the following is a correct hypothesis for an experiment testing the effect of temperature on bacterial growth?

If the temperature is increased, then bacterial growth will increase up to an optimal point., A hypothesis predicts the relationship between the independent variable (temperature) and dependent variable (bacterial growth).

In an experiment testing how different fertilizers affect plant growth, what is the independent variable?

Type of fertilizer, The independent variable is what the experimenter changes, in this case, the type of fertilizer.

Which objective lens should you start with when using a microscope?

Starting with the lowest magnification (4x) ensures easier focusing and locating the sample.

Which adjustment knob is used to sharpen the image after focusing with the coarse adjustment knob?

The fine adjustment knob refines the focus for clarity.

What best describes the difference between a hypothesis and a theory?

A hypothesis is an educated guess tested in an experiment; a theory is a well-substantiated explanation with extensive evidence.

What is the effect of a hypotonic solution on an animal cell and a plant cell?

Animal cell swells and may burst; plant cell swells but is prevented from bursting by its cell wall.

What is the total magnification if the ocular lens is 10x and the objective lens is 40x?

400x

The metric system is a ______ system with units based on the power of ______.

Decimal, 10

Which feature is unique to eukaryotic cells compared to prokaryotic cells?

Membrane-bound organelles

What is the proper way to carry a microscope?

Hold with one hand on the arm and one hand supporting the base.

What is the result of converting 1500 grams to kilograms in the metric system?

1.5 kg, To convert grams to kilograms, divide by 1000.