What are some problems UV light can cause to tissue?
What will be an ideal response?
It causes collagen and elastin fibers to clump, making the skin less elastic and more prone to wrinkling. Damage to DNA can lead to skin cancer. Exposure to UV light can break down folate, one of the B vitamins.
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You have a plant that naturally exhibits simple leaves, but you would like to change the shape of the leaves from simple to compound. What gene could you over-express in your plant to induce compound leaf formation?
A) Bicoid B) MONOPTEROS C) PHANTASTICA D) Cytoplasmic deteminants E) Sonic Hedgehog
Which of the following statements about patterns of energy use among countries is false?
A. Individuals in larger countries use more energy than individuals in smaller countries. B. Individuals in high-latitude countries use more energy than individuals in equatorial countries in part because of the need to heat buildings. C. Countries where individuals travel more frequently have higher levels of energy use than countries where individuals travel less frequently. D. Individuals in countries with higher standards of living use more energy than countries with lower standards of living. E. Energy use is distributed unevenly among countries.
Organisms with true radial symmetry
A) have their sense organs, mouth, and brain clustered in the head. B) tend to be highly mobile. C) do not have a distinct head region and tend to be sedentary or passive drifters. D) can be divided into two matching halves along only one plane.
Which growth response causes the shoots of a plant grown in the dark to grow upward?
A) phototropism B) thigmotropism C) gravitropism