Which of the following best describes the relationship between DNA, proteins, and RNA?
a. DNA is transcribed into RNA, then RNA is translated into proteins.
b. DNA is transcribed into proteins, then proteins are translated into RNA.
c. DNA is translated into RNA, then RNA is transcribed into proteins.
d. DNA is translated into proteins, then proteins are transcribed into RNA
Answer: a. DNA is transcribed into RNA, then RNA is translated into proteins.
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What is the main advantage of controlled burnings of forested areas? Controlled burnings _____
A) eliminate the possibility of forest fires B) clear forested areas for farmland C) prevent the overgrowth of the underbrush D) allow new species to form
A Hawaiian legend tells of a village that angered a shark god. In revenge, a "seaweed" began to grow in the tidepools that killed anyone who touched it. In fact, this "limu-make-o-Hana" -- a zoanthid cnidarian -- contains a palytoxin that locks the sodium-potassium pump open, allowing free flow of ions. If a villager suffers palytoxin poisoning, which way will the ions in his neurons flow?
Palytoxin is incredibly toxic, perhaps the second most dangerous non-peptide 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"). A. all ions will flow out B. potassium in, sodium out C. chloride and sodium out, potassium in D. sodium in, potassium out Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content/Choose Answer · What do you already know about sodium and potassium? What other information is related to 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 is NOT a reason why microorganisms may have an inherent natural resistance to an antibiotic?
A) The organism may be able to pump out an antibiotic entering the cell. B) The organism may be impermeable to the antibiotic. C) The organism may be able to mutate the antibiotic target site to avoid antibiotic binding. D) The organism may be able to alter the antibiotic to an inactive form. E) None of the above.
An atom will react with other atoms only until:
A) it forms four covalent bonds B) all of its inner orbitals have been filled. C) it has completely filled its outermost energy level. D) it has less stability.