Question

1. the microscope component that moves the tube up and down to focus on a specimen when using the low-power objective is the

a. diaphragm.
d. fine adjustment knob.
b. coarse adjustment knob.
e. none of the above.
c revolving nosepiece

1. which of the following consumer products does not depend on cellular action?

a. yogurt
b. leather
c. cheese
d. beer
e. all of these products depend on cellular

1. which of the following statements is not a part of the cell theory?

a. new cells arise from cells that already exist.
b. all cells contain a true nucleus.
c. all living things are composed of one or more cells.
d. the cell is the smallest entity that retains the properties of life.

1. which of the following compounds is a component of cell membranes?

a. nucleic acids
c. proteins
b. cellulose
d. water

1. all of the following contain their own dna except the

a. mitochondrion.
c. nucleus.
b. chloroplast.
d. ribosome.

1. the organelle responsible for ribosome formation is the

a. golgi apparatus.
d. nucleolus.
b. endoplasmic reticulum.
e. vesicle.
c. nucleus.

1. heavy smoking may impair the body’s ability to move debris trapped in mucus out of the lungs by affecting the

a. flagella.
d. cilia.
b. cell membrane.
e. mitochondria.
c. vesicles.

1. light microscopes are used by biologists to study

a. mitochondrial chemistry.
d. microfilaments.
b. living cells.
e. none of the above.
c. microtubules.

Explanation:

Question 1

The coarse adjustment knob on a microscope is used to move the tube up and down for focusing, especially with the low - power objective. The diaphragm controls light intensity, the revolving nosepiece changes objectives, and the fine adjustment knob is for fine - tuning focus (usually with high - power). So the correct option is b.

Yogurt and cheese are made with the help of bacterial (cellular) fermentation. Beer is made through yeast (cellular) fermentation. Leather is produced by treating animal hides, and this process does not rely on cellular action. So the correct option is b.

Cell theory states that all living things are made of cells, the cell is the basic unit of life, and new cells come from pre - existing cells. Prokaryotic cells do not have a true nucleus, so the statement "All cells contain a true nucleus" is not part of cell theory. So the correct option is b.

Answer:

b. coarse adjustment knob.

Question 2