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dimaraw [331]
3 years ago
6

Timeline of the development of cell theory

Biology
1 answer:
Kisachek [45]3 years ago
6 0

Answer:

From the years 1838-1839, the German scientist Matthias Schleiden proposed the first foundational belief about cells, that all plant tissues are composed of cells. ... The image above shows a drawing of the microscope set up used by Robert Hooke in 1665 in which he first saw cells in a thin slice of cork.

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Sonographic findings of severe micromelia, decreased or absent ossification of the spine, macrocephaly, and micrognathia describ
andrew-mc [135]

Answer: Option A.

Achondrogenesis

Explanation:

Sonographic findings of severe micromelia, decreased or absent ossification of the spine, macrocephaly, and micrognathia are conditions of Achondrogenesis because

Achondrogenesis is a genetic disorder that is as a result of mutations in gene SLC26A2 which is responsible for cellular transport proteins that is needed for the growth and development of bones and cartilage. This condition lead to malformation of bones and cartilage and it is characterized by short limbs, small body, narrow chest ,prominent abdomen,underdeveloped lungs,lack of ossification in the spine and pelvis, prominent head, small chin e.t.c.

It is a condition that affects infants.

The major treatment is pallative care in which the doctor have to reduce pain stress of bones and cartilage and also genetic councellling.

7 0
3 years ago
Which of these describes a quantitative observation?
r-ruslan [8.4K]

D. is the answer

Malory

3 0
3 years ago
What 3 functions do proteins have in a plasma membrane?*
Aliun [14]

Answer:

Explanation:

Proteins in the plasma membrane have several functions based on their components, location etc. For instance, if the protein transcends the entire plasma membrane it could be a transport protein, responsible for the import and export of certain molecules between the cell and the extracellular matrix (ECM). If the proteins are resting at the surface of the cell, facing the ECM, their role could be to detect components in the ECM, relaying a series of messages back to the nucleus so that the cell can ‘decide’ what it should do with this information (is it being told it should undergo apoptosis, should it begin to divide, should it migrate?). As well as this, it could be involved in the detection of foreign bodies such as pathogens. This is an extremely job for these proteins because if the cell does come in contact with a pathogen, the cell can use these proteins to engulf the pathogen and through a series of steps, present the antigen on their major histocompatibility complexes (either 1 or 2 depending on the cell type) or HLA’s for human cells. Thus it can be concluded that protein functions vary widely in the plasma membrane and due to the vast number of proteins that can be found there, it’s difficult to narrow down the exact main of functions of all these proteins put together.

4 0
2 years ago
Which of the following statements about minerals is false? A. Minerals reflect light in different ways. B. The color of a minera
UkoKoshka [18]

Answer: B. The color of a mineral's powder doesn't change.

C. The densities of many minerals are quite similar.

D. A mineral can break in only one way.

A mineral is a naturally occurring inorganic compound. It is a chemical compound that usually found in crystalline form. The color of the mineral's powder can change because of the oxidation or reduction of particles present in it. The density of many minerals cannot be same because all mineral particles exhibit different composition of atoms or molecules which are responsible for physical and chemical structure of minerals. Hence, minerals vary in density. A mineral can be broken down into many ways like fracture, cleavage and other methods.  

3 0
2 years ago
Molecules that are readily soluble in water are considered ____________.
BigorU [14]

Answer:

Molecules that are readily soluble in water are considered polar molecules.

Explanation:

Molecules that are readily soluble in water (or other polar solvents) are considered polar molecules. This is because they can form dipole-dipole bonds or hydrogen bonds, which allows them to form joints with water molecules and thus dissolve in it.

8 0
3 years ago
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