sulfur cycle
What will be an ideal response?
Sulfur dioxide from the atmosphere becomes available to terrestrial and marine ecosystems when it is dissolved in precipitation as weak sulfuric acid or when it falls directly to Earth as fallout. Weathering of rocks also makes sulfates available to terrestrial ecosystems. Decomposition of living organisms returns sulfates to the ocean, soil, and atmosphere.
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A lac Y- mutant would
A) be constitutive. B) no longer be induced by the presence of lactose. C) not have ?-galatosidase activity. D) transport lactose into the cell effectively. E) metabolize lactose.
In eukaryotes, precursor mRNA molecules are processed in the
A) ribosomes. B) nucleus. C) mitochondria. D) cytoplasm. E) nucleolus.
Why is smoking cigarettes so dangerous to human health?
What will be an ideal response?
In the ABC model of flower development in Arabidopsis thaliana, sepals form when which gene(s) is/are switched on?
A. A only B. A and B C. B and C D. C only E. A and B and C