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Vesnalui [34]
3 years ago
12

Over time, bacteria have become increasingly resistant to antibiotics. Explains this in terms of natural selection.

Biology
1 answer:
zlopas [31]3 years ago
6 0

Answer:

Bacteria with antibiotic resistance gene/s are favored by natural selection.  

Explanation:

The presence of one or more antibiotic resistance genes in the bacteria becomes an adaptive trait in the presence of antibiotics in the surroundings. These bacteria have higher chances of survival and reproduce more to produce more progeny as compared to the bacteria that lack any antibiotic resistance gene. Therefore, the frequency of antibiotic-resistant genes in the population increases over the generations. Here, the increased fitness of bacteria having antibiotic resistance gene/s in the presence of antibiotics represents a natural selection.

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What element is necessary for the production of thyroid hormone?
liubo4ka [24]

Answer:

Iodine

Explanation:

This is a trace element needed for the  synthesis of the two thyroid hormone ; T4- thyroxine and T3-triiodothyronine. Four iodine molecules are added in T4 synthesis, and  three for T3 synthesis. Generally T4 is the major hormone produced, but  biologically transformed into active form T3.

Iodine majorly and selenium are the two trace elements needed for thyroid hormones synthesis. Therefore required amount of iodine is important in daily diet. iIn adequate supply of this leads to under production of iodine called hypothyroidism. poor brain development ( especially in kids),and goiter.

Sea foods . eggs, poultry seaweeds are rich sources of iodine.

Conversely, when  excessive amount is present in the blood, autoimmune thyroid diseases can occur,including cancer developments in the thyroid gland due to hyper cell activities.

8 0
3 years ago
What characteristic does a spinocerebellar tract neuron share with a sensory neuron originating in the quadriceps femoris?
ivann1987 [24]
Both the neurons carry afferent information. The axons of the neurons are the afferent nerve fibers, and carry the information to the central nervous system. They are a part of the peripheral nervous system. These neurons are also called as sensory neurons.
5 0
3 years ago
If otters that are brown & white combine to make a new 3rd phenotype, a tan otter, what type of dominance is being exhibited
arlik [135]

Answer: 3 Codominance

Explanation:

5 0
2 years ago
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Are all organs weighed on a triple beam balance ?
Elanso [62]

No,not all organs are weighed on a triple beam balance.

<u>Explanation:</u>

  • Usually smaller sized organs like adrenals, thyroid are commonly used to be weighed on triple beam balance, whereas larger organs like lungs, liver and heart can only be weighed on grocer's scale.
  • Only weight of the smaller body organs can be measured very precisely with the help of triple beam balance, where as if we measure the weight of the larger organs using the same triple beam balance,then the resultant value thus obtained will not be accurate enough.
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6. Contractions of the myocardium pump __________________ through the circulatory system.
malfutka [58]

Answer:

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Contractions of the myocardium pump blood through the circulatory system.

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