Two groups of tomatoes were grown under laboratory conditions, one with humus ad
ID: 268353 • Letter: T
Question
Two groups of tomatoes were grown under laboratory conditions, one with humus added to the soil and one a control without humus. The leaves of the plants grown without humus were yellowish (less green) compared with those of the plants grown in the humus-enriched soil. The best explanation for this difference is that________.
Select one:
b. the heat released by the decomposing leaves of the humus caused more rapid growth and chlorophyll synthesis
c. the humus made the soil more loosely packed, so water penetrated more easily to the roots
d. the healthy plants used the food in the decomposing leaves of the humus for energy to make chlorophyll
In a similar experimental set-up as described in the previous question, a MUTANT tomato plant is grown along side wild type tomato in the humus-containing soil. Despite being in the same soil conditions the mutant plant has yellow-ish leaves.
Mutations to which of the following genes could explain the mutant phenotype? (answer all that apply)
Select one or more:
a. Mutation eliminates a gene encoding a proton pump (moves H+ only against its concentration gradient).
b. Mutation eliminates a gene essential for the formation of root hairs.
c. Mutation eliminates a gene encoding a H+/Mg2+ cotransporter.
Explanation / Answer
ANSWER
a. the humus contained minerals such as magnesium and iron, needed for the synthesis of chlorophyll
ANSWER
a. Mutation eliminates a gene encoding a proton pump (moves H+ only against its concentration gradient).
b. Mutation eliminates a gene essential for the formation of root hairs.
c. Mutation eliminates a gene encoding a H+/Mg2+ cotransporter.
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