Charles Darwin is best known for developing ________
a. the theory of blending inheritance
b. improved varieties of fruits and vegetables
c. the chromosome theory of inheritance
d. the theory of natural selection
d
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What is the correct sequence of steps during infection of plants by nitrogen-fixing bacteria?
A) Rhizobia release Nod factors; roots release flavonoids; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. B) Rhizobia release flavonoids; roots release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. C) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; nodule forms; infection thread grows into the root cortex. D) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. E) Nodule forms; infection thread grows into the root cortex; rhizobia proliferate inside of root hair; rhizobia release flavonoids and Nod factors.
What is the dominant photosynthetic pigment found in all types of algae?
a. Chlorophyll b b. Chlorophyll c c. Chlorophyll a d. Phycoerythrin e. Chlorophyll d
The landing platform for pollen in flowering plants is the
a. filament. b. stigma. c. anther. d. style. e. ovary.
Which of the following is a normally correct base pairing in transcription?
A. (DNA)A...U(mRNA) B. (mRNA)C...G(tRNA) C. (DNA)U...A(mRNA) D. (DNA)A...T(tRNA)