Which of the following samples would contain the MOST genetic diversity?
A) viral metagenomes from the ocean
B) bacterial metagenomes from the ocean
C) microbial eukaryotic metagenomes from the ocean
D) viral metagenomes from human red blood cells
Answer: A
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The only known source of human embryonic stem cells is:
a. placental tissue. b. umbilical cords. c. early human embryos. d. brain tissue. e. nerve tissue.
Ribbon worms belong to the phylum:
a. Nemertea. b. Platyhelminthes. c. Arthropoda. d. Ctenophora. e. Cnidaria.
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?
Are constructed of all four basic tissue types
a. Organs. b. Systems. c. Cells. d. Organelles.