The carotenoids and other accessory pigments in the chloroplast help capture light into the reaction center's chlorophyll molecules
Indicate whether the statement is true or false
TRUE
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Researchers introduce DNA into plants by
using I. bacteria II. electric shocks III. chemical shocks
a. I only b. II only c. III only d. II and III e. I, II, and III
Species that are r-strategists are usually larger than those that are K-strategists
Indicate whether the statement is true or false
Which of the following statements about the types and subtypes of the influenza (flu) virus is FALSE?
A. Flu subtype is determined by the kinds of proteins representing the H and N protein spikes making up the capsid of the virus. B. The A(H2N2) and the A(H3N2) strains of the virus require different vaccines. C. Of the three major types of flu virus (A, B, and C), only Type A can occur in humans, other mammals, and birds. D. High mutation rates create more diversity in strains of flu than does genetic recombination. E. Genetic recombination between influenza and other types of viruses is common.
Genes that have homologs in a variety of species have been discovered through the analysis of genome sequences
In fact, it is not uncommon to find a family of homologous genes encoding proteins that are unmistakably similar in amino acid sequence in organisms as diverse as budding yeast, archaea, plants, and humans. Even more remarkably, many of these proteins can substitute functionally for their homologs in other organisms. Explain what it is about the origins of cells that makes it possible for proteins expressed by homologous genes to be functionally interchangeable in different organisms.