. Which of the following flowering plant
structures is most like the dikaryotic hyphae of
a fungus?
a. the central cell of a female gametophyte
b. the immature male gametophyte
c. the egg cell of an ovule
d. the endosperm of a seed
e. none of these flowering plant structures are
like the dikaryotic hyphae of a fungus
A
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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?
What is the term for mutant alleles that can act dominantly to predispose a cell to a cancerous phenotype?
A) Polymerases B) Oncogenes C) Activators D) Tumor-suppressor genes
A buildup of H+ in the blood will lead to ____
a. alkalosis b. acidosis c. excess calcium d. excess carbon dioxide e. a higher than normal pH
The Biological Species Concept:
a) is the best and most accurate species concept. b) states that species that live together will eventually start breeding. c) states that a species is any group which shares similar DNA. d) states that any organisms that are biologically similar constitute a species. e) defines a species as any group of actually or potentially interbreeding species that produce viable offspring