Nitrogen is a growth-limiting nutrient for many organisms because
A. it is necessary for the biosynthesis of amino acids.
B. it is required for synthesis of nucleotides.
C. it is required for lipid synthesis.
D. only a small number of bacteria are able to extract it from the atmosphere.
E. only a few microbes can extract it from the atmosphere, but all organisms require it for amino acid and nucleotide synthesis.
Answer: E
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Which of the following are not present in plant cells?
a. endoplasmic reticulum b. Golgi complex c. lysosomes d. mitochondria
Cancer associated with aflatoxin exposure is connected to ____
a. heredity b. viruses c. chemical carcinogens d. radiation e. weakened immunity
In the section "Investigating Life: Birds Do, Bees Do It", the experiment supports that a change in just one gene locus may have jump-started speciation in Mimulus. This is an example of
A. pre-zygotic barriers to reproduction. B. post-zygotic barriers to reproduction. C. gradualism. D. punctuated equilibrium. E. asexual reproduction.
Which of these studies is a meta-analysis?
A) a study that examined a link between nitrogen in the soil and yellowing of leaves B) a study that summarized research reports from many laboratories around the world indicating a relationship between a diet high in plants and colon cancer C) a study that reported on seed germination rates at many different temperatures D) a study that related transpiration rates in a number of different plants to weather conditions over many areas in North America