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Explain what is DNA?
DNA: DNA is the source of the information that directs the development of the cell. Although all segments of DNA are not active in every cell in the human body, every cell has a complete copy of DNA from both parents, comprising 23 sets of chromosomes.
In human cells, heat, radiation, chemicals, and other factors can damage DNA. However, the cell has specific repair enzymes that are highly effective in repairing DNA damage.
Explain briefly how the stimulus at the finger produces an impulse in the sensory neurone using the following key words. 1. Energy conversion (linked to receptor) 2. Na+ in 3. Depo
Explain Lipoprotein (Lp(a) Excess ? While cholesterol and triglycerides are important lipid risk factors, another lipoprotein factor called Lipoprotein (a) is thought to play a
Whenever a pair of alleles has different alleles is there dominance between them? Not in all cases of a gene includes two different alleles is the dominance complete. There are
Q. What is the destination of the notochord in protochordates and in vertebrates? In vertebrates the notochord disappears and gives birth to the spinal column known as vertebra
Q. Which is the kind of muscle tissue that moves the bones? The bones are moved by the skeletal striated muscles these muscles are voluntary (controlled by volition).
State about visual system It is important for our visual system to adapt to recognize objects clearly in differing conditions of light. The main mechanisms concerned with
An interesting observation made by an American biologist H.C. Bumpus (1899) provides a good explanation for normalising selection. Bumpus collected some 136 injured house sparrows
V apour Theory (i) It was proposed by a Greek philosopher Pythagoras in 500 B.C. (ii) Each organ of an animal body emitted some kind of vapour and that a ne
If a cell were placed in a hypertonic solution what could it do to protect itself?
You are working on a protocol in lab that requires 10ml of a 5% saline solution for a particular step. All you have in your lab is a 20% saline stock solution. How can you dilute t
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