A linear stretch of DNA that specifies the sequence of amino acids in a polypeptide is called a(n)
1.codon.
2.intron.
3.messenger.
4.gene.
5.enzyme.
4
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Research by Harrison and van Buuren illustrates how mycorrhizae can reduce the need for applying
a. nitrogen fertilizer to crops. b. potassium fertilizer to crops. c. phosphorus fertilizer to crops. d. nitrogen fixing plants to soils. e. nitrogen fixing bacteria to soils.
Arabidopsis is a model organism for the study of ________
Fill in the blank(s) with correct word
What happens to neurons in the approach known as optogenetics?
A) Mutations to ion channel proteins are corrected. B) The neurons are made to express light-sensitive ion channels. C) Neurotransmitter stores are depleted. D) Fusion of neurotransmitter vesicles to the presynaptic membrane is blocked. E) Leakage of cytoplasmic polyanions is blocked.
You want to calculate the relative water content of a sapling. You measure the fresh weight to be 11.95g, the turgid weight to be 12.5g, and the dry weight to be 11.5g. What is the RWC of this plant, and is it likely to live or die?
A. 100%; live B. 55%; live C. 45%; die D. 45%; live E. 55%; die