How did researchers determine the proteins involved in the secretory pathway?
a. interfering with the translation of proteins and examining the cell's ability to transport fluorescently tagged
proteins
b. adding a detergent to the cells to lyse the membranes and examining transport of fluorescently tagged proteins
c. genetically engineering mutations in genes and measuring changes in Golgi complex morphology
d. treating cells with inhibitors of the secretory pathway and measuring changes in Golgi complex morphology
e. altering the pH of the media to selectively regulate different enzymes and measuring changes in Golgi
complex morphology
ANSWER: a
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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?
The group of protists to which you are most closely related is:
A. the choanoflagellates B. slime molds C. Rhizaria D. Foraminifera E. Stramenopila
These are characterized by branching, so that one neuron sends messages and has contact with many other neurons
a. axon b. dendrite c. cyton d. glial cell e. ependymal cell
Lipid-soluble signaling molecules, such as testosterone, cross the membranes of all cells but affect only target cells because _____
A) only target cells retain the appropriate DNA segments B) intracellular receptors are present only in target cells C) only target cells possess the cytosolic enzymes that transduce the testosterone D) only in target cells is testosterone able to initiate the phosphorylation cascade leading to activated transcription factor