Q1. A patient has an 80 percent blockage of his left anterior descending coronary artery. Illustrate what occurs in terms of myocardial oxygen supply and demand if his sympathetic nervous system is stimulated. Q2. When a homozygous black, solid-hoofed male pig was mated to a female from pure breed of […]

Virtual Lab: Variation in Plant Life Cycles The life cycle of all plants is complex because it is characterized by alternation of generations. Plants alternate between diploid sporophyte and haploid gametophyte generations, and between sexual and asexual reproduction. The ability to reproduce both sexually and asexually gives plants the flexibility […]

Q1. An experiment is planned to study mechanism of sucrose uptake by plant cells. Cells are immersed in a sucrose solution, and pH of the solution is monitored. Samples of the cells are taken at intervals, and their sucrose concentration is measured. Their sucrose uptake correlates with a rise in […]

Q1. Blueberry jam is high in sugar, a substance cells typically use for energy, and it contains enough other macromolecules to give the nutrients required to support cell growth. Yet jam can be left unrefrigerated for long periods without contamination by bacteria and mold. Which provides the best explanation for […]