Most plant viruses have ___________ as their genetic material.
A. DNA
B. nulceotides
C. proteins
D. RNA
D. RNA
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According to W. W. Rostow's model of economic development, in order for a country to be ready for "take-off" it must have
A) an investment in manufacturing equal or greater than 10 percent of national income. B) a physical infrastructure and a social/political elite. C) comparative advantages in international trade, which it exploits. D) a majority of the population engaged in tertiary activities. E) a democratic form of government.
What structure is responsible for the exchange of gas in leaves?
a. Aerenchyme b. Propagule c. Lenticels d. Stomata
A cross of two Kerry horses always produces Kerry. A cross of a Kerry with a Dexter horse produces
1/2 and 1/2. Crosses of two Dexters produce two Dexters for every Kerry. Explain. What will be an ideal response?
Studies of gene mutation frequencies have shown that __________
A) mutations are rare, and genomes are generally stable B) mutation frequencies differ among organisms and also between genes, suggesting certain genes are more susceptible to mutation C) mutation frequencies are consistent between organisms, and each region of DNA is equally susceptible to random mutations D) Both A and B are correct E) Both A and C are correct