Which of the following is the most plausible explanation for these findings?
(A) A cell surface protein on cell 4 signals cell 3 to induce formation of the worm's intestine.
(B) The plasma membrane of cell 4 interacts with the plasma membrane of the posterior portion of cell 3, causing invaginations that become microvilli.
(C) Cell 3 passes an electrical signal to cell 4, which induces differentiation in cell 4.
(D) Cell 4 transfers genetic material to cell 3, which directs the development of intestinal cells.
Ans: (A) A cell surface protein on cell 4 signals cell 3 to induce formation of the worm's intestine.
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_____ alleles are both expressed
a. Dominant b. Codominant c. Pleiotropic d. Hybrid
In RNA synthesis, thymine is complementary
to
a. guanine b. adenine c. cytosine d. uracil e. more than one of these
You are a forensic biologist and have been asked to review the files of an old, unsolved murder case. The autopsy report is missing a lot of important information, but you read that the victim had a thymus gland that was just starting to shrink
Based on this information alone, what can you conclude about the victim? A) He died of natural causes, most likely an autoimmune disease. B) His lymphatic system was infected and being destroyed by an unknown virus. C) He was between 12 and 16 years old. D) He was between 1 and 6 years old.
Palytoxin is incredibly toxic, perhaps the second most dangerous nonpeptide toxin. It targets the sodium-potassium pump, locking it open and forming a channel through which the ions can passively flow. Palytoxin is produced by zoanthid cnidarians (soft coral), and there have been incidents of poisoning from zoanthids within marine aquaria tanks in people's homes. It is also thought to be the source of the legend of the Limu make o hana ("Seaweed of Death from Hana").What is the likely impact of this toxin on the resting potential of a neuron?
A. The resting potential will promote action potentials with a larger depolarization. B. The resting potential will be more negative. C. The resting potential will require more energy to maintain. D. It will destroy the ion gradients necessary for the resting potential.