`1. you are designing an artificial drug-delivery “cell” that can penetrate anim
ID: 270461 • Letter: #
Question
`1. you are designing an artificial drug-delivery “cell” that can penetrate animal cells. Which of these protist structures should provide the most likely avenue for research along these lines?
A) pseudopods
B) apical complex
C) excavated feeding grooves
D) nucleomorphs
E) mitosomes
19) Considering that mature sporophytes of true moses get their nutrition from the gametophytes on which they grow, and considering these generations as individual plants,
4) in the late 1880;s farmers discovered that spraying a mixture of lime and sulfur was very effective in controlling San Jose scale insects that previously ravaged their orchards. But by 1900, the lime- sulfur cure was failing and this insect pest returned to its initial abundance in the orchards. Which of the following statemnets best explains why the abundance of the San Jose scale insects reoccurred.
A) the farmers sloopily combined the line – sulfur mixture formula and started using an inferior mix
B) Natural selection caused the San Jose scale insects to mutate, creating a new line-sulfur resistant species.
C) lime-sulfur resistant scale insects were more likely to survive and reproduce
d) lime-sulfur resistant scale insects displayed less efficient photosyntheise metabolism
Explanation / Answer
1. Apical Complex is a structure possessed by individuals of the phylum Apicocomplexa. The individuals of this phylum are unicellular, spore-forming, parasitic alveolates and the structure Apical complex is used to penetrate a host cell and take over its genetic machinery. So, the protist structure which is most suitable for the above-mentioned experiment is Apical complex.
4. There is always a variation in genetic make up of all sexually reproducing organisms. Such variations provide an individual with advantage in case of a disease outbreak. San Jose scale insect pests develop a resistance to a Lime Sulphur solution through natural selection. When this solution is sprayed, the most resistant individuals are the ones to survive and pass on their genetic traits to the next generation, This genetic resistance is then passed on through generations causing the growth of a population which is resistant against this lime sulphur solution. So the correct answer for this question is " lime-sulfur resistant scale insects were more likely to survive and reproduce?."
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