21- A nanometer is a) 10-6 meter c) 10-9 c) 109 meter e) 10-12 meter b) 10-8 met

Question

21- A nanometer is a) 10-6 meter c) 10-9 c) 109 meter e) 10-12 meter b) 10-8 meter d) 10-10 meter The complex structures of DNA and protein found in the cell nucleus are a) nucleoplasm c) histones e) mitochondria b) chromosomes d) nucleases 23. An excess of hydrogen ions in the body fluids can have disastrous results because a) excess hydrogen ions can break chemical bonds b) excess hydrogen ions can change the shape of large complex molecules, rendering them nonfunctional c) excess hydrogen ions can disrupt tissue functions d) excess hydrogen ions can kill living cells e) all of the above 24, Artificial sweeteners a) are naturally similar to sugars b) are always some form of carbohydrate c) are generally 100 or more times sweeter than sucrose d) are inorganic sugar substitutes e) produce the same number of calories as the equivalent amount of sucrose 25, All of the triplet codes neded to produce a specific polypeptide chain are found in an) a) chromosome c) codon e) none of the above b) gene d) anticodon

Explanation / Answer

21. Option C is correct.

1 nm = 10^-9 m

22. Option B is correct.

DNA + Histone proteins = Chromosomes.

23. Option E is correct.

Excess H+ ions = Acidic pH.

Acidic pH can have disastrous effects on cellular metabolism.

24. Option C is correct.

Artificial sweeteners are sweeter than sucrose.

25. Option E is correct.

Triplet codon information is found in the mRNA. mRNA is produced from the gene.

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