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A strand of DNA consists of thousands of smaller, repeating units known as...
Nucleotides
In molecules of DNA, which nitrogenous base bonds with Adenine?
Thymine
Which nitrogenous base is normally present in DNA but absent in RNA?
Thymine
Which two bases are present in equal amounts in a double-stranded DNA molecule?
Cytosine and Thymine?
Adenine and Thymine?
Adenine and Uracil?
Cytosine and Uracil?
Adenine and Thymine
All nucleotides of DNA and RNA contain a....
Uracil base?
Thymine base?
Ribose sugar?
Phosphate group?
Phosphate group
The genetic material in living organisms is composed of organic molecules known as....
Starches?
Lipids?
Nucleic Acids?
Fatty Acids?
Nucleic Acids
In a DNA molecule, the number of Guanine nucleotides will most likely equal the number of ___________ nucleotides?
Cytosine
Based on nucleic structure, in what way do DNA molecules differ from RNA molecules?
RNA contains Uracil and DNA does not
Which structure pairs with adenine nucleotide during the formation of messenger RNA?
Phosphate-ribose sugar-Uracil
Knowledge of the structure of DNA is important in the study of life because DNA...
stores food?
transmits genetic information?
transmits chemical energy?
stores enzymes?
Transmits genetic information
True or False?
DNA directs the production of enzymes?
True
True or False?
RNA has a double helix shape?
FALSE.... that's DNA
Who were the two scientists that proposed the double helix arrangement of the DNA molecule?
Watson and Crick
Which element is present in all nucleic acids, but not in amino acids?
Phosphorus
Which element is present in all nucleic acids, but not in amino acids?
A. Hydrogen
B. Phosphorus
C. Oxygen
D. Iron
Phosphorus
In humans there are 23 pairs of chromosomes. One pair of the 23 are sex chromosomes. The other 22 pairs are known as...
Autosomes
homozygotes
heterozygotes
Centromeres
Autosomes
