A new flower species has a unique photosynthetic pigment. The leaves of this plant appear to be blue-green. What wavelengths of visible light does this pigment reflect?
A. green, red, and violet
B. green and blue
C. red, yellow, and green
D. blue and violet
E. red and yellow
B. green and blue
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Birds and fish contain high amounts of yolk in their eggs. What can be said about cell cleavage during embryonic development in these animals?
A. It is meroblastic. B. It is holoblastic. C. It is complete. D. The blastula that forms involved cleavage through the entire egg. E. It is impossible for bird and fish eggs to undergo cleavage during development.
When blood returns from the pulmonary circuit, it first enters which chamber of the heart?
a. left atrium b. left ventricle c. right atrium d. right ventricle e. both the left atrium and the right atrium
Your research project involves sea cucumbers, a poorly-understood group of echinoderms. You are trying to determine whether they block polyspermy by changing membrane potential like sea urchins do. In the chart below, you have counted the number of embryos that complete normal development after fertilization in either normal or low-sodium artificial sea water (ASW), for each of three sets of experiments. Looking over your data, what do you conclude?
A. Sea cucumbers appear not to block polyspermy the same way as sea urchins, which use an influx of Na+ that changes the membrane potential.
B. Sea cucumbers appear not to block polyspermy the same way as sea urchins, which use an outflow of Na+ that changes the membrane potential.
C. Sea cucumbers appear to block polyspermy the same way as sea urchins, via an influx of Na+ that changes the membrane potential.
D. Sea cucumbers appear to block polyspermy the same way as sea urchins, via an outflow of Na+ that changes the membrane potential.
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 fertilization in sea urchins? What other information is related to the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
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?
Chemical signals produced by leukocytes that affect other leukocytes are ____.
What will be an ideal response?