Answer: The correct answer is B) No cell nucleus.
Archaea is a domain that comprises of single celled microorganisms, which are prokaryotes. These organisms can survive in extremely harsh conditions like hot springs and salt water.
Example- Methanogens.
Archea was first classified as a separate group of prokaryotes under the three domain classification system of Carl Woese in 1977 that included Archaea, Bacteria, and Eukarya.
Since they are a group of prokaryotic organisms, therefore, they are devoid of nucleus and membrane bound cell organelles.
Thus, option B) is the right answer.
B.) They are photosynthetic
C.) They are multicellular
D.) Their cells contain a nucleus
The characteristic that is not typical of an animal is B.) They are photosynthetic. Animals are heterotrophic, consume organisms for energy, and do not photosynthesize like plants.
The characteristic among the provided options that is not typical of an animal is B.) They are photosynthetic. Animals are heterotrophic, signifying that they need to consume other organisms for energy, unlike plants which are photosynthetic and can generate their own food using sunlight.
Additionally, Animalia Kingdom is classified by its members being multicellular and having cells with a nucleus. B.) They are photosynthetic is a characteristic more closely associated with plants than animals.
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B. testosterone
C. estrogen
D. insulin
The hormone does the pineal gland release A. melatonin. Therefore , A. melatonin is correct .
Pineal Gland: The pineal gland is located deep within the brain, in the epithalamus region. It is a photosensitive organ, which means it can detect changes in light and darkness.
Melatonin Production: Melatonin production is closely tied to the perception of light. When the surroundings become dark, the pineal gland is stimulated to produce melatonin, which is released into the bloodstream.
Circadian Rhythms: Melatonin is a key player in the body's circadian rhythms, influencing the sleep-wake cycle, body temperature, and various hormonal fluctuations throughout the day and night.
Sleep Regulation: The pineal gland's release of melatonin helps promote drowsiness and prepares the body for sleep. This is why melatonin supplements are sometimes used to address sleep disorders or jet lag.
Other Functions: Beyond regulating sleep, melatonin also has antioxidant properties and is thought to play a role in immune system support and the regulation of reproductive hormones.
Light Exposure: The suppression of melatonin production during the day is primarily due to exposure to natural and artificial light. This is why it's often recommended to limit exposure to screens before bedtime to help maintain healthy sleep patterns.
For such a more question on hormone
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Answers:
A. melatonin
Explanation:
Melatonin is a neurotropic hormone with the antioxidant group indolamina, which is synthesized by pincal glands located in the brain from the amino acid compound tryptophan.
Answer: The codon of the mRNA molecule is CGA.
tRNA ( transfer RNA) molecule carries a sequence of three bases in its anticodon loop, which are complementary to the mRNA ( messenger RNA) codon. mRNA codon codes for a particular amino acid like CGA in this case codes for Arginne ( R), which is carried by the tRNA molecule in its amino acid attachment site.
When anticodon matches with the codon in the mRNA, amino acids are assembled in a particular order, which is dictated by the codon of mRNA.
Thus, the codon of mRNA for the anticodon GCU is CGA
Answer:
It creates a representation of something difficult to see.
Explanation:
In science, a model is a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly. Models are central to what scientists do, both in their research as well as when communicating their explanations.
Answer:
D It creates a representation of something difficult to see.
Explanation:
answer from gradpoint
Answer:
Meiosis produces four genetically different haploid cells.
Gametic chromosomes have a different combination of alleles than parental chromosomes as a result of independent assortment
Explanation:
Meiosis and Mitosis are two types of cell division that occurs in living organisms. However, Mitosis produces daughter cells that are genetically identical to the parent cell while meiosis produces daughter cells that are genetically different from the parent cell. This accounts for the reason meiosis leads to genetic variation.
The production of genetically different cells by meiosis is as a result of the process of the random orientation of chromosomes during metaphase I of meiosis I. This process is called INDEPENDENT ASSORTMENT. However, crossing over occurs during prophase I of meiosis between non-sister chromatids of homologous chromosomes.
Mitosis and meiosis are processes of cell division. Mitosis results in two identical diploid cells, while meiosis creates four varied haploid cells, due to independent assortment and crossing over, which brings about genetic variation.
Both mitosis and meiosis are indeed processes of cell division that occur in living organisms. The fundamental difference between them is that mitosis produces two genetically identical diploid cells (cells with two complete sets of chromosomes), while meiosis results in four genetically varied haploid cells (cells with one complete set of chromosomes).
In mitosis, the division of the nucleus takes place, with each daughter cell receiving a full complement of chromosomes identical to those of the parent cell. On the other hand, in meiosis, two divisions occur, resulting in four daughter cells with half the number of chromosomes as the parent cell. These cells are further genetically unique, for two reasons: Independent assortment where the pairs of homologous chromosomes line up at the equator of the cell in a random manner, and crossing over, a process during which homologous chromosomes exchange portions of their DNA.
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