Four of the following were likely in Earth's earliest atmosphere. Which one was not?
A. Hydrogen
B. Nitrogen
C. Oxygen
D. Carbon dioxide
E. Water vapor
Answer: C
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Based on a variety of experiments, it is known that the rate of photosynthesis is highest when wavelengths of light between 400 and 500 nm are used, and when wavelengths around 700 nm are used. What does this indicate about the relative importance of chlorophyll a and b in photosynthesis?
A. Reflection of light by chlorophyll a and b is essential for the process of photosynthesis
B. Absorption of light by chlorophyll a and b is essential for the process of photosynthesis
C. Transmission of light by chlorophyll a and b is essential for the process of photosynthesis
D. Chlorophyll a and b are much less important than other pigments in the reflection, absorption and transmission of light relevant to photosynthesis
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about the role of pigments during photosynthesis? What other information is related to the question?
Choose Answer
Do you have all the information needed to analyze the graph and answer the question?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following best reflects the concept of fetal programming?
a. A woman smokes and binge drinks during her pregnancy, and experiences a miscarriage in the first trimester. b. A woman experiences a hurricane while pregnant, and the child's genes are marked to be highly sensitive to stress. c. An active fetus creates distress for a woman while pregnant, which leads her to be less attached to child in infancy. d. A doctor selects the most genetically healthy embryos to implant in a woman's uterus following in vitro fertilization.
As stem cell research rapidly developed, it became a political and ethical issue. Describe how the ethical and political approach toward stem cell research has changed in the past decade
What will be an ideal response?
Cell walls can be found as part of:
A) bacterial cells. B) protists and animal cells. C) plant cells, bacteria, fungi, and protists. D) animal cells, fungi, and protists. E) plant cells.