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4 years ago

Do you think it is possible to understand life by using an electron microscope to study nonliving organisms?

1 answer:

4 0

For an electronic microscope to be effective, it works in vacuum so that the beam of electrons (the main source of illumination) is not scattered by air molecules. The specimen is placed in a vacuum chamber. Cells cannot survive in a vacuum hence only studied when dead in an electron microscope.

The disadvantage of studying dead cells is that they limit the understanding of cellular processes because they cannot be viewed in real-time. Studying live cells allows scientists to understand physiological changes of cells and their biological relevance.

You might be interested in

Lysosomes use what to break down foreign matter and dead cells?

ladessa [460]

I believe they use enzymes

5 0

3 years ago

In what way do two alleles for the same trait differ?

kvasek [131]

I think it’s C explanation : i learned this a while ago

8 0

3 years ago

The transport problems of a freshwater organism

Norma-Jean [14]

Answer:

Can't live in salt water..

Explanation:

4 0

3 years ago

What are some foods that don't have cellulose in it

Kobotan [32]

Answer: Tomato sauce

Salad dressing

Ice cream bars

Whole wheat bread

Granola bars

Packaged cookies

Bagels

Frozen breakfast sandwiches

Frozen diet entrées

Breakfast cereal

Veggie burgers

Salad dressings

Boxed cake mix

Worcestershire sauce

Hot sauce

Frozen filled pasta (like ravioli)

Packaged fruit cups

Corn tortillas

Flour tortillas

Vegetarian soy-based "meats"

Frozen pizza

Sour cream

Flavored coffee syrups

Cheese spreads and dips

Dried soup mixes

Packaged cupcakes

Frozen breaded fish

Frozen pie crusts/potpies

Sorbet

Coffee creamer

Explanation:

6 0

3 years ago

Each ABO blood group is associated with the presence/absence of RBC antigens and the presence/absence of antibodies in the plasm

harina [27]

Answer:

a. Type O blood - No A or B antigens on RBCs-Anti-A antibodies in plasma-Anti-B antibodies in plasma

b. Type A blood - A antigen on RBCs- Anti-B antibodies in plasma

c. Type B blood - B antigen on RBCs- Anti-A antibodies in plasma

d. Type AB blood - A antigen on RBCs- B antigen on RBCs- Neither anti-A or anti-B in plasma

Explanation:

ABO blood grouping system represents multiple allelism which was discovered in humans by Karl Landsteiner. The blood group is determined by the presence or absence of A & B antigens and antibodies.

The 4 blood groups which exist in ABO system are O, A, B and AB. Also, allele A and B are co-dominant i.e. if they both will exist on the surface of an RBC then both will be equally expressed which implies that there will be no dominant or recessive allele.

Type O blood group has H antigen on the surface of RBC and has both the antibodies i.e. antibody A and B. The absence of antigens A and B makes it a universal donor.

Type A blood group has A antigen on RBC and has antibody B in the plasma.

Type B blood group has B antigen on RBC and has antibody A in the plasma.

Type AB blood group has both the antigens i.e. antigen A and B on RBC and does not have any antibody in the plasma which makes it a universal acceptor.

3 0

3 years ago