The side group (R group) of the amino acid shown above contains which of the following functional
groups?
a. hydroxyl
b. carbonyl
c. carboxyl
d. sulfhydryl
e. amino
E
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Imagine that a researcher has discovered a 500 million-year-old leaf fossil from the Cambrian Period. He notices that the leaf had very few stomata compared to present-day leaves
What does this tell the researcher about atmospheric CO2 levels during the Cambrian Period? A. Atmospheric CO2 levels were higher during the Cambrian Period compared to today. B. Atmospheric CO2 levels were lower during the Cambrian Period compared to today. C. Atmospheric CO2 levels during the Cambrian Period were equal to present-day levels. D. Nothing, as CO2 was not part of Earth's atmosphere during the Cambrian Period.
Color pigments produced by ____ are used to dye woolens and litmus
a. club fungi b. mushroom c. algae d. lichens e. puff balls
Explain why the liver has a major role in protein metabolism. What will be an ideal response?
When a bacteriophage infects a bacterial cell, it injects ________ into the host cytoplasm.
A. RNA B. DNA C. lipids D. carbohydrates E. protein