Energy cannot be created or destroyed; it can only change from one form to another. There is always as much energy after an event as there was before, but some of the energy may be wasted as heat that escapes into the surroundings.
Answer:
39 double-helical DNA molecules will be presenet in sperm and 39 in egg.
Explanation:
Each chromosome is made up of histone protein and a molecule of DNA.
Each cell contain double number of chromosomes (2n) except a few exceptions like sperm (1n) and egg (1n).
Human body cells contain 46 chromosomes while sex cells contain 23 chromosomes because of meiosis. Similarly dog cells contain 78 chromosomes while their gametes i.e egg and sperm each contain 39 chromosomes. The fertilization of sperm and egg will restore the chromosome numbers.
<em>As there is only one double helix DNA present in chromosome, so there would by 39 double helix DNA in sperm and 39 double helix DNA in egg. </em>
Answer:
The correct answer is B.. The enzyme is like a lock, and the substrate is like a key.
Enzymes are bioctalyst which accelerate the bio-chemical reactions taking place inside the living organisms.
Enzymes have specific region in their structure for the binding of their substrate which is called as active site. The shape of the active site of the enzyme complements the shape of the substrate.
The shape and amino acid residues of the active site provide the specificity to the enzyme for its substrate.
It can be easily explained with the help of lock and key model in which a substrate (key) perfectly docks in the active site (key hole) of the enzyme (the lock).
An approach that uses passive solar heating instead of electricity for businesses and homes is known as A. Daylighting.
<h3>What is daylighting?</h3>
This is the illumination of buildings with natural light through the practice of placing reflective surfaces so that sunlight can provide effective internal lighting.
Solar heating is the use of sunlight to heat water or air in the buildings using radiant light and heat which is harnessed using a range of technology such as solar power to generate electricity.
Hence, we can see that neither weatherizing, green roofing nor cool roofing is the answer because they do not deal with providing passive solar heating, but daylighting uses passive solar heating.
Therefore, the correct answer is option A.
Read more about<em> solar heating</em> here:
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