Use of CFCs depletes the __________ in the upper
atmosphere and allows more UV radiation to reach
Earth’s surface. Fill in the blank(s) with the appropriate word(s).
Answer: ozone layer
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Refer to the figure above. Which of the following forms a monophyletic group?
A) A, B, C, D B) C and D C) D, E, and F D) E, F, and G
After giving birth, female bighorn sheep lick their newborn lambs. This behavior continues off and on for up to 6 hours, after which mothers no longer lick their lambs. What is/are the ultimate cause(s) of this behavior? Check all that apply.
_____ Hormones released during labor stimulate motor neurons in female bighorn sheep, causing them to lick and groom their lambs. _____ The lamb is stimulated by the licking to begin nursing from its mother and the sooner a lamb begins nursing, the better its chances for survival. _____ Female bighorn sheep remember being licked by their mothers and know they must teach this behavior to their own offspring. _____ Licking the lamb removes excess moisture from its coat, preventing hypothermia. _____ When licking the lamb, the mother learns its unique scent so she can distinguish it from other lambs and offer it protection from predators or extreme weather.
How many genes are carried on the X chromosome?
a. 260 b. 20,000 c. 6,660 d. 2,000 e. 3,450
Reduction of nitrate to nitrite by Paracoccus denitrificans is an example of anaerobic respiration.
Answer the following statement true (T) or false (F)