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Q1. Healthy individuals of Paramecium bursaria contain photosynthetic algal endosymbionts of the genus Chlorella. What time within their hosts, the algae are referred to as zoochlorellae. In aquaria with light coming from only one side, P. bursaria gathers at the well-lit side, whereas other species of Paramecium gather at the opposite side. The zoochlorellae provide their hosts with glucose and oxygen, and P. bursaria provides its zoochlorellae with protection and motility. P. bursaria can lose its zoochlorellae: (1) if kept in darkness, the algae die, and (2) if prey items (mostly bacteria) are absent from its habitat, P. bursaria will digest its zoochlorellae.
Which term precisely describes the behavior of Paramecium species that lack zoochlorellae in an aquarium with light coming from one side only?
a. negative chemotaxisb. positive chemotaxisc.negative phototaxisd.positive phototaxis
Q2. Assume that, during biological research, it became possible to incorporate fully functional chloroplasts into the basal layer of our epidermal skin cells. Knowing the structure and function of chloroplasts, how will this influence our body?
Cyanobacteria grow prolifically in streams and lakes with low oxygen levels and high nutrient concentrations. How may the presence or absence of cyanobacteria be used as an index of pollution in lakes.
In maize, a dominant allele (A) is essential for seed color as opposed to colorless (a). Another gene has a recessive allele (w) which results in waxy starch, as opposed to normal starch (W).
Based on the results of your investigation, what conclusions could you draw about the relationship between a muscle's workload and its threshold of stimulation.
The idea is that this arrangement will allow animals and plants to migrate between refuges. Why will such migration be important. Which of the compounds that normally protects the liver and other vital organs.
Which of the follow statements regarding cancer risk factors is false. Mutagens are generally not carcinogens.
Women's bladders, on average, are smaller than those of men. The distribution of bladder volume in women is approximately N (400, 75) in milliliters. Find the proportion of women's bladders with a volume between 500 and 600 ml.
The altered tRNA translates the UGA as tryptophan. What nucleotide varies has probably occurred in the mutant tRNA molecule? What consequences will the presence of such a mutant tRNA have for the translation of the normal genes in this cell.
He speculated that geologic columns would have the most height of 72,000 feet. Using his approach and numbers, compute the approximate age of the earth he came to.
Determine which of these would synthesize the enzymes for Histidine synthesis
What is the most possible explanation. Cultures from dialysate concentrate and the internal areas of the dialysis machines were negative; iodophor from a small in- use plastic container yielded a pure culture of P. aeruginosa. What improper method le..
Briefly explain why this mating produces a triploid individual. Why can mitosis proceed normally in triploid cells, but meiosis cannot.
Protein classification schemes
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