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sleet_krkn [62]
2 years ago
11

Can you please help

Biology
1 answer:
Julli [10]2 years ago
3 0

There are two cell divisions in meiosis ( Meiosis 1 and Meiosis 2). It has the same thing as mitosis but it happens twice.

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Anybody ???????????????
oee [108]

Answer:

1 is A 2 is D 3 is B 4 is C

Explanation:

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6 0
2 years ago
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A nurse is caring for a client who has cancer. the clien has decided to stop treatment and requests a refferal to hospice
Dominik [7]
The nurse has to do as the client requested. This is because they have to observe the autonomy aspect of the ethical standard which states that the client's must be respected. Autonomy gives the patient power to make his or her own decisions concerning health care.
8 0
3 years ago
Compare and contrast light microscopes, scanning electron microscopes, and transmission electron microscopes. Sort each statemen
podryga [215]

Answer:

<u>Light microscope</u>:

  • use a beam of light to produce magnified images
  • can be used to examine living cells and tissues

<u>Scanning electron microscope</u>:

  • use a beam of electrons to produce magnified images
  • can be used to examine DNA
  • can be used to examine cells

<u>Transmission electron microscope</u>:

  • use a beam of electrons to produce magnified images
  • can be used to examine DNA
  • can be used to examine cells

Explanation:

Light microscope: is a commonly used microscope also known as compound microscope. Magnifies images from 40X upto 1000X. It uses ray of visible light to produce a magnified image. The light microscope can be used to view specimen of both living and dead cells or tissues. However, it doesn't give a detailed view of a specimen like electron microscope.

Scanning electron microscope: It uses electron beam as an illuminating source. It has a much higher resolving power than light microscope because it uses electrons instead of light. It magnifies object upto 500000 times the actual size. Internal structures can also be viewed. However, only dead specimen can be used because the beam of electrons can kill the cells. They are of two types:

  1. <u>Scanning electron microscope(SEM): </u>an electron beam passes over the specimen's surface and displaces electrons which are then focused on  a screen to form an image. Images appear in 3-D
  2. <u>Transmission electron microscope: </u>electromagnets magnify the image by passing beam of electrons through a thin specimen. Images appear in 2-D

7 0
3 years ago
Compare and contrast the causes and process of primary and secondary succession.
liberstina [14]

Answer:Primary succession occurs on land that is new and has never had a flora and fauna example: glacier retreats, lava flows. Secondary succession occurs on land that has been cleared example: by fire, of flora and fauna, but which still has viable seeds and spores in the soil.

7 0
2 years ago
Freeze fracture is a technique used to visualize membrane proteins. In this technique, cells are rapidly frozen and then split,
beks73 [17]

Answer: If freeze fracture technique used in the fluid mosaic model  we can found membrane proteins are randomly dispersed throughout the phospholipid bilayer and integral transmembrane protein that span entire membrane

Explanation:

Freeze fracture is a technique which can be used for visualized membrane structure and protein distribution.in this technique first a cell is rapidly frozen in liquid nitrogen.after that it cleaved lipid bilayer .then two section are coated with platinum, then acid is used to dissolve organic material resulting a replica in the surface will  be obtained. then replica are view in electron microscope.

we can found protein are embedded in the lipid bilayer.

5 0
2 years ago
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