Question

1.
Comprises of 20 questions of 1 mark each
How many pairs of chromosomes are present in the nucleus of every cell
of human beings ?
2.
Write two names of lubricants.
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Answer 1

Answer:

1) Humans have 23 pairs of chromosomes, for a total of 46 chromosomes.

1) Humans have 23 pairs of chromosomes, for a total of 46 chromosomes.2)Common examples of internal lubricants include fatty alcohols, esters (low esterification), and EVA wax. External lubricants provide metal release and help reduce process temperature. Common examples of external lubricants include PE waxes, paraffin, metal soaps, esters (high esterification), amides, and fatty acids.

Answer 2

Answer:

1)23 pairs

2)fatty alcohols,esters(low esterification),Eva wax

Explanation:

1)For example, humans have 23 pairs of chromosomes--22 pairs of numbered chromosomes called autosomes, 1 through 22, and one pair of sex chromosomes, X and Y.

2)Common examples of internal lubricants include fatty alcohols, esters (low esterification), and EVA wax. External lubricants provide metal release and help reduce process temperature. Common examples of external lubricants include PE waxes, paraffin, metal soaps, esters (high esterification), amides, and fatty acids.