OPTIONS:
a. Water from the late was not tested for other possible pathogens b. Residents of other nearby towns were not tested for the bacteria c. The residents' genetic predisposition for getting ill was not determined d. Other sources of drinking water were not tested for bacteria
Answer:
d. Other sources of drinking water were not tested for bacteria
Explanation:
The source of error in the experimental design of the students stems from the failure to collect samples from other sources of the town's drinking water. The samples collected and tested were simply unrepresentative of the drinking water supply of the town, as the samples collected only represented water from the lake, which is 80% of the town's supplies of drinking water.
To arrive at a good conclusion, samples collected should represent adequately, all sources of drinking water of the town, rather than just representing supply from mainly the lake, which accounts for 80%.
It could be that the source of bacterial infection might emanate from other sources of drinking water that was not represented in the samples collected for testing.
Answer:
Explanation:
DNA polymerase
Use of radioactive deoxyribonucleotides as raw material for DNA synthesis makes DNA polymerase to use these radioactively labeled dNTPs to make new DNA strands. Hence, DNA polymerase enzyme can make radioactively labeled DNA by using radioactive deoxyribonucleotides as raw material.
Answer:
Synthetic
Explanation:
Synthetic drugs are drugs that are man-made and chemically-created in a lab by modifying the molecular or chemical structure of another substance. The synthetic drug now has properties and effects that are similar to that of the substance that is being mimicked.
Various illicit drugs such as marijuana and cocaine are being synthesized to create synthetic drugs to mimic them. An example of a synthetic drug is synthetic marijuana also called Spice or K2.
The colour of the flowers is the variable in the above-mentioned experiment.
It is a method of performing cross-pollination where the transfer of the pollen grains from the anther of one flower of a plant to the stigma of another flower of a plant happens by the insects.
It is often called insect pollination. The flowers that are pollinated by insects have attractive petals of bright colours. This adaptation ensures that the insects will be attracted to the flowers.
The nectar present in these flowers, on which the insects feed is also sweet with an attractive scent. This is another factor which attracts the insects to the flowers.
It is by way of sucking the nectar that the insects also get pollen stuck on their mouth regions and legs. The pollen grains produced by these flowers are also sticky.
Therefore, to examine if monarchbutterflies prefer a specific coloured flower, different plants with different coloured flowers need to be used and the colour of the flowers will be the variable.
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