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Usimov [2.4K]
2 years ago
5

When does cell differentiation occur? Question 1 options: when cells express the same gene when cells express different genes wh

en cells express all genes when cells do not express genes
Biology
1 answer:
serg [7]2 years ago
5 0

Answer:

The answer is when the cell express different genes.

Explanation:

Cell differentiation is the process when a cell is changed from one cell type to an other and brings more complexity to the system. A cell before differentiation possess all the genes however their expression in turned off. When some external or internal factors trigger the gene expression it starts the cell differentiation. A multicellular organism undergoes several rounds of cell differentiation during its development. Although cell differentiation changes the size, shape and metabolic activity but the genetic makeup or DNA is never changed during cell differentiation.

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Chloroplasts are found in __________. chloroplasts are found in __________. neither plant cells nor animal cells animal cells on
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Plant cells and some Protists
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Compared with a eukaryotic cell, a prokaryotic cell Select one:______
juin [17]

Answer:

The correct option is a. lacks organelles beyond ribosomes.

Explanation:

All cells of higher organisms are bounded by a cell membrane (also called plasma membrane or plasmalema) and contain cytoplasm that surrounds one or more nuclei. Within the cytoplasm there are structures known as organelles, which are specialized in carrying out the metabolic processes of the cell, these cells are called eukaryotes. The prokaryotes are smaller, lack a differentiated nucleus and organelles. The prokaryotic cells are not internally divided by membranous walls, but consist of a single space.

Both prokaryotic and eukaryotic cells contain ribosomes. Ribosomes are organelles not delimited by membranes, these organelles are important since a cell makes all its proteins in its ribosomes.

8 0
3 years ago
A woman who is a carrier for colour blindness (X-linked recessive) has children with a man who has normal colour vision. A. What
guajiro [1.7K]

Answer:

A. X^CX^c

B. 1/4 or 25%

C. 1/4 or 25%

D. No

Explanation:

<em>Let the allele for color blindness be represented by c.</em>

A. <em>The genotype of a woman that is a carrier for color blindness = </em>X^CX^c

   The genotype of a man with normal color vision = X^cY

Crossing the two in a marriage:

                    X^CX^c      x      X^cY

             X^CX^c      X^CY    X^cX^c    X^cY

From the result of the cross:

B. <em>1/4 or 25% of their children are expected to be color blind. </em>

C.<em> 1/4 or 25% of their children are expected to be carriers of the allele for color blindness.</em>

D. <em>No. The couple cannot have a girl that is color blind. Their female children could either be totally free of the color-blindness allele or be a carrier.</em>

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3 years ago
The generation time of bacterial cells is shortest during the ________ phase.
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During the lag phase


7 0
2 years ago
Compare and contrast the process of osmosis and diffusion. give an example
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 <span>They are both a form of passive transport, meaning that no cellular energy is required for the processes to take place. 
They both involve the movement of materials from an area of high concentration to an area of low concentration. 
The main difference is one of definition. When WATER is diffusing from one place to another, like across a membrane, the process is called OSMOSIS. The movement of any other substance is just called DIFFUSION.
_________________________________________________________-xoCote♥'</span>
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