Nitrogen is an essential nutrient for optimal plant growth because it is used to build
A. DNA.
B. protein.
C. mitochondria.
D. nucleic acids.
E. All of these are correct.
Answer: E
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Which of the following statements about isotopes in living systems is false? a. Radiation can be used to create visual images
b. Living organisms can avoid taking up a radioactive isotope but still absorb the normal isotope of the same element. c. Radioactive sugar is used to measure rates of cell activity. d. Radioisotopes can be used as tracers to follow the movement of an element through a living system.
It took more than 100,000 years for the human population to grow to one billion individuals and took about ____ years
to add five billion more. a. 200 b. 20,000 c. 100,000
d. 200,000 e. 500,000
A current view of how the human and chimpanzee can share most of their nucleotide sequence yet exhibit significant phenotypic differences is that many of the most important sequence differences alter _____
A) structural genes B) the number of repeated sequences C) regulatory sequences D) environmental factors
When the DNA of a bacterial phage is integrated into a host bacterial cell, it is considered to be _________.
a) latent b) a prophage c) attenuated d) competent