What are the 3 types of tissues that comprise the ground tissue system, and what are their functions? What will be an ideal response?
Concepts to Consider: 1) Parenchyma--photosynthesis (contain chloroplasts); storage of starch, oil,
water, and salts; secretion; possible differentiation into other types of cells. 2) Collenchyma--flexible
structural support in soft plant organs; allows plants to grow upward. 3) Sclerenchyma--hard, strong
tissue that provides support for plant body.
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Which of the following molecules are believed to have been absent from the primitive reducing atmosphere?
A. nitrogen (N2) B. oxygen (O2) C. carbon dioxide (CO2) D. water vapor (H2O) E. hydrogen (H2)
If you live on a river delta or coastline, you may not be able to eat the local shellfish because of high levels of toxins, even though you may be able to drink the water taken from the same source. Why?
A. Shellfish filter-feed and concentrate the dilute pollutants from the water, thus acting as early warning indicators of severe pollution. B. Shellfish regularly consume poisonous red tide organisms. C. Shellfish seasonally produce toxic substances. D. Most harmless native clams have been replaced by bad species.
Melatonin secretion influences ____.
A. secondary sex characteristics B. glucagon production C. adrenal function D. seasonal changes in behavior E. Graves’ disease
Some retrotransposons and retroviruses integrate preferentially into regions of the chromosome that are packaged in euchromatin and are also located outside the coding regions of genes that contain information for making a protein
Why might these mobile genetic elements have evolved this strategy?