Which of the following is TRUE of spirochetes?
A) They are peritrichous.
B) They are Gram-positive.
C) They are able to penetrate a host's tissues.
D) They are obligate intracellular organisms.
E) They are pleomorphic.
C
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When adenylyl cyclase is activated ________
A) cAMP is created B) cAMP is destroyed C) G proteins bind to cAMP D) steroid hormones pass through the lipid bilayer
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?
One major innovation in animal body plan was the development of the coelom. Describe the role of the coelom
What will be an ideal response?
Matching I. Choose the one most appropriate answer
for each. 1. ___ abortion 2. ___ abstinence 3. ___ coitus 4. ___ douching 5. ___ ejaculation 6. ___ implantation 7. ___ lactation 8. ___ menopause 9. ___ menstruation 10. ___ miscarriage 11. ___ orgasm 12. ___ ovulation 13. ___ tubal ligation 14. ___ vasectomy A. the production and secretion of milk B. sloughing off of endometrium stops permanently C. induced dislodging and removal of an embryo or fetus from the uterus D. an abortion that occurs spontaneously E. the burrowing of the blastocyst into the uterine lining F. the release of an egg from the ovary G. the release of seminal fluid from the male reproductive tract H. a 100-percent-effective method of preventing conception I. a highly unreliable form of birth control J. the periodic elimination of the uterine lining K. characterized by involuntary muscle contractions, release of tension, and warmth L. sexual intercourse M. sperm and egg cannot meet because a section of oviduct is missing N. cutting and tying of vasa deferentia