Plants produce steroids called phytosterols, which have various functions in plant physiology. Some phytosterols are thought to have a defensive function, however, specifically in repelling insect herbivores
How might plant-derived steroids help protect plants from insect attack?
In some cases, the plant-derived steroids are sufficiently similar to insect steroid hormones that they can wreak havoc with insect physiological functioning and development when ingested. Debilitating or killing insect herbivores reduces tissue loss to the plant.
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In garden peas, one pair of alleles controls the height
of the plant, and a second pair of alleles controls flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with purple flowers crossed with a dwarf plant with white flowers produces 1/4 tall purple, 1/4 tall white, 1/4 dwarf purple, and 1/4 dwarf white. What is the genotype of the parents? What will be an ideal response?
If the primary somatosensory cortex is destroyed by
a stroke, what is impaired? a. movement on both sides of the body b. reception of sensory information from skin and joints c. movement by the right side of the body d. movement by the left side of the body e. none of these
Which of the following is notusually involved in the processing of primary mRNA transcripts?
A. addition of multiple adenosines to the 3' end B. covalent joining of exons C. methylation of nucleotides at the 5' end D. insertion of intron sequences
Which group of fungi has flagellated spores and gametes?
1.chytrids 2.sac fungi 3.lichen 4.dikaryotic mycelium