Gymnosperm seeds are usually carried bya. wind c. animals b. water d. all of the above
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Gymnosperm seeds usually contain embryos which can be carried by water, wind and or animals. Eventually, these seeds will germinate in different environment. In this case, the answer would be d. all of the above which include the 3 answers.
Answer: It is D all of the above.
Which best describes the importance of mitosis to living organisms?
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For multicellular organisms, mitosis is responsible for growth, replacement of dead cells and tissue regeneration. For the single-celled organisms, mitosis is responsible for asexual reproduction .
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What type of scientist studies how bacteria are affected by antibiotics
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The type of scientist that studies how bacteria are effected by antibiotics are called micro biologist
Layers of epithelial tissue that serve as barriers to pathogens is called
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Answer:
The correct answer is: Mucus membrane.
Explanation:
The lining of the epithelial tissue forming the mucus membrane contains some specialised cells which are called the Goblet cells.
These cells secrete a slippery substance called the Mucus.
The Mucus is a dense, aqueous and slippery substance that is composed of anti-microbial enzymes like lysosyme, immunoglobulins (antibodies) and glycoproteins like mucins.
The mucus secreting cells line the internal tracts of the body that come into contact with outside environment, like the respiratory tract, alimentary canal, urino-genital tract.
If any microbial pathogen gain access into any of these tracts the lysosyme in the mucus causes the microbial cells to undergo lysis, hence killed.
The immunoglobulins, on recognising a pathogen, activate the immune cells of the body to fight against the intruding pathogen.
Where in an embryo are the instructions located for how to build organs
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All the instructions are encoded in the DNA within the nucleus. We don't fully understand how the zygote, with the same genetic material as our adult cells, instructs the newly developing embryo to form tissues and organs, but it is all in the DNA.
It's cell differentiation signals produced by nucleus of cells. In an embryo, there are unspecialized pluripotent embryonic stem cells that rely on cell signals to differentiate into organs, even before the embryo is formed, in the blastocyst stage, there are 2 layers of cells, the inner cell mass is destined to form internal organs, and the outer ball of cells forms skin cells, intestines etc
Are genetic defects associated with abnormalities of autosomes or of a sex chromosome
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Genetic defects are associated with both abnormal autosomes as well as abnormalities in the gender-based chromosomes. Autosomal abnormalities occur if there is an abnormality on any of the first 22 pairs of chromosomes. The abnormality is linked to gender if it occurs on the twenty-third chromosomal pair. Both of these abnormalities are due to chromosomal errors or genetic mutation.
Downs Syndrome is a common genetic disorder that causes developmental delays and health problems. This disorder occurs when the person has extra genetic material added to the twenty-first chromosome.
they are asscoicated with both abnormal autosomes as well as anoborlits ingender