In the experiment outlined in the figure above, what would you expect to happen if researchers supplied an enzyme that blocked the expression of the Dll gene?
A) The embryo would have appendages in abnormal locations.
B) The origins of the embryo's appendages would fluoresce.
C) The developing embryo would have no appendages.
D) The embryo's appendages would be shorter than usual.
Answer: C
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Ice floats in liquid water because
a. ice forms hydrogen bonds with the surface of liquid water. b. ice forms hydrogen bonds but liquid water does not. c. the hydrogen bonds of liquid water are fixed in place. d. liquid water forms hydrogen bonds but ice does not. e. the distance between water molecules is maximized due to the hydrogen bonds which are fixed in place.
Stratospheric ozone is important because it:
a. traps reradiated heat from Earth. b. prevents heat penetration from the sun. c. replenishes the surface ozone layer. d. dissipates the surface ozone layer. e. blocks solar UV radiation.
Which of the following structures is found inside the nuclear membrane?
A. endoplasmic reticulum B. centriole C. cell membrane D. nucleolus
Plants such as peppermint and sage contain oils. What is the function of these oils?
A. They help keep the plant from drying out. B. They keep other plants from germinating nearby. C. They help repel insects. D. They have hormone-like activity that helps wounds heal. E. They prevent fungal infection.