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sergeinik [125]
3 years ago
8

If a cell has 40 chromosomes, how many centromeres would it have when it is in metaphase? a. 1 b. 2 c. 20 d. 40 e. 80

Biology
1 answer:
Alla [95]3 years ago
8 0

Answer:

Basically this depends on the type of cell division the cell undergoes.

if the cell undergoes reduction division of meiosis(n) the  chromosome number will be reduced to 20 so the centromere will be 20, However if the cell undergoes multiplication division of mitosis,(2n) the centromere will be 40, since the chromosomes number will increases and sister chromatids holding the chromosomes are held at centro mere.

Explanation:

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vovangra [49]

Answer:

option A

Explanation:

In carrying out these experimental procedure, the same restriction enzyme that is used to cut out the gene of interest should also be the same used for the cutting of the plasmid to generate sticky ends. Then the desired gene is inserted into the cut plasmid  then treatment with DNA ligase. Purified DNA ligase is utilized in gene cloning to join/ligate DNA molecules together forming a recombinant DNA. Thus, step 3 should be carried out after step 4.

5 0
2 years ago
Why is it argued that speech is only possible in modern homo sapiens and not in homo erectus or homo neanderthalensis? the brain
Oxana [17]

Answer: homo sapiens is the only species with a large enough oral cavity and a low enough larynx to allow for speech production. 

<span>One line of evidence that speech only possible for modern homo sapiens is the anatomy of their throat. Speech depends on certain anatomical arrangements and the Homo sapiens is the only species with a large enough oral cavity and a low enough larynx that would allow speech.</span>

4 0
3 years ago
Two species of birds feed on mistletoe berries. The birds are active at different times of the day and do not come into contact
I am Lyosha [343]

Answer:

The correct answer is B. exploitation

Explanation:

Exploitation competition occurs when the interaction of two species is indirect when they complete for the same resource like food, place, etc. The use of resources by one individual species reduces the amount of resources for the other species leading to competition.

So over time the more fit species will out complete the less fit species. So here two species of bird feed on the same food but at different times and so they reduce resources for each other which is an example of exploitation competition.

6 0
2 years ago
A person with an injury to her frontal lobe may have
gtnhenbr [62]
Increase in irritability , ie change in mood and an inability to regulate behaviour
8 0
3 years ago
What is happening in this photo
Ostrovityanka [42]

Answer:

Bacteriophages are attaching to bacterial cell wall and injecting genetic material.

Explanation:

Bacteriophage:

A bacteriophage (bacteria eater) is a type of virus that infects bacteria. Bacteriophages are composed of genetic material (DNA or RNA) enclosed in a protein shell or capsid.

Following are steps of bacteriophage infection:

  1. Bacteriophage attaches to cell surface receptors on the surface of the bacterium.
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  4. After replication, the phages burst open the bacteria cell and are released. This is called the lytic cycle of bacteriophage infection.
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* The second step of the infection cycle is pictured here.

4 0
3 years ago
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