Answer:
All the options are true except option D.
Explanation:
Archaea are a group of prokaryotic organisms i.e. they lack a membrane bound nucleus. They are one of the the three domains of life (the other two being bacteria and eukarya). Archeans possess a cell wall like bacteria but it is not composed of peptidoglycan, like bacteria cell wall.
Archeans are generally known to be found in very severe environmental conditions, hence, they are referred to as extremophiles e.g Some are thermoacidophiles i.e. thrive in very hot and acidic environment while others are extreme halophiles i.e. thrive in salty regions. Archeans known as methanogens produce methane gas as a product of metabolism from carbon dioxide and hydrogen.
However, the domain archeae was only found to be in existence recently after the domain bacteria, hence, they are not considered to evolve before the domain bacteria.
Option A is correct. After making a punnet square, we can see that the genotypic ratio would be 1:2:1, being 25% dominant, 25% recessive and 50% heterozygous. However, we are asked for the phenotypic trait percentage. The phenotypic ration is 3:1, with 75% polka dotted tail (dominant gene active) and 25% solid tail (recessive gene active).
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Answer:
c) absorption of water in the large intestines
Explanation:
The correct answer is (b)The vestibular sense may be capable of sensory adaptation
Astronauts experience similar feelings of dizziness and disorientation upon arrival in space and upon their arrival back on Earth because the vestibular sense may be capable of changing adaptation. The dizziness and disorientation is due to the floating fluid in inner ear around zero gravity and it goes right away after some time when the astronauts reach the space. The adaptation is done by the brain to ignore the signals of the ear; the feeling this sensation for sometime the brain becomes adaptable and does not listens to the inner ear every time. This is a kind of sensory adaptation.
Answer:
The correct answer is option b, that is, injection of antibodies to the toxin.
Explanation:
In countries like the United States, the cases of snake bites are very common. The effect of the bite of the snake depends on the fact that whether it is venomous or harmless. Even a bit of a harmless snake can result in allergic reactions. On the other hand, the bite of venomous snakes is considered deadly and needs to be treated as a medical emergency.
A bite from a poisonous snake can lead to different kinds of symptoms like convulsions, localized pain, and inflammation, paralysis, and nausea. In case, if the severity of the bite is more, that is, if the condition is life-threatening, a doctor may use antivenom. Antivenom is a form of antibodies produced to tackle the symptoms of poisonous snake bites. The administration of antivenom is required to be done as quickly as possible to get the desired result.
