Which of the following is within the range of heat escaping from the surface of Earth?
a. infrared radiation
b. gamma rays
c. UV radiation
d. X-rays
Answer: a. infrared radiation
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DNA is favored as the storage molecule of genetic information because it ____ than RNA
a. has more nucleotides b. has greater chemical stability c. can assemble into longer coding sequences d. has more nucleotides and greater chemical stability e. has greater chemical stability and can assemble into longer coding sequences
Physiological saline is 0.9 percent NaCl; red blood cells placed in such a solution will not gain or lose
water; therefore, one could state that the fluid in red blood cells is hypertonic.
Indicate whether the statement is true or false.Sister chromatids of a pair of homologous chromosomes form tetrads, and crossing-over (exchange of genetic information between regions of non-sister chromatids in the tetrad) occurs during which phase?
a) mitotic prophase b) meiotic prophase I c) mitotic metaphase d) meiotic metaphase I e) meiotic prophase II
In the 1940s, proteins were thought to be the more likely molecules to house genetic information. What was the primary reason that DNA was not originally believed to be the genetic material?
(a) DNA has a high density of negative charges. (b) Nucleotides were known to be a source of chemical energy for the cell. (c) Both protein and nucleic acids were found to be components of chromosomes. (d) DNA was found to contain only four different chemical building blocks.