Once the embryo has implanted, the inner cell mass becomes
a. the neural tube.
b. somites.
c. the embryonic disk.
d. the coelom.
e. the neural plate.
C
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Viruses may cause cancer in these three typical ways:
_____ Some viruses encode an oncogene in their genome. _____ A viral genome may integrate into the host chromosome, disrupting a cell cycle gene. _____ Some viral proteins interact with cell cycle regulatory proteins. _____ Viral infection provides large amounts of nutrients, encouraging the cell to divide and proliferate. _____ All viruses promote host cell proliferation, as a way to spread more virus. _____ Cell proliferation is an adaptive response of the host to any viral infection, to outgrow the virus. _____ When a DNAvirus brings extra DNA into the host cell, that signals that S phase is complete. 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 the link between viruses and cancer? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Insect growth and metamorphosis is controlled by the steroid hormones ecdysone and juvenile hormone (JH)
In insects like butterflies and moths that have a distinct larval (juvenile) and adult stage, the relative amount of JH determines whether the insect molts to the next juvenile stage or switches to become an adult. Can you think of a way to use this hormonal system to control caterpillar agricultural pests?
Which component of a muscle does the calcium ion combine with to allow a contraction to occur?
A) myosin head B) actin C) troponin D) T tubule
Which of the following is photosynthesizing bacteria?
a) euglena b) diatoms c) prions d) dinoflagellates e) cyanobacteria