When the DNA in a cell is uncoiled and spread throughout the nucleus, it is called
A) a chromosome. B) a centromere. C) chromatin. D) a chromatid.
C
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Which of the following could possibly account for an increase in Hox genes and an increase in animal body complexity?
A. Different Hox genes are expressed in different regions of the body. B. Hox genes duplicated once during animal evolution. C. Duplication of Hox genes and duplication of Hox gene clusters throughout animal evolution. D. Inversion of Hox genes about 600 million years ago. E. The creation of Hox gene clusters through inversion and uncontrolled replication.
Which of the following can be used as an energy source inside a human body?
a. proteins b. carbon dioxide c. water d. oxygen
Prior to 1940, which type of molecule did scientists consider to be the best candidate for the genetic material?
a. a protein molecule b. a carbohydrate molecule c. a DNA molecule d. a lipid molecule
Use the basic steps of the scientific method to describe Pasteur's experiments to investigate spontaneous generation
What will be an ideal response?