In response to induction by the optic vesicle,
a. genes coding for crystallin and keratin are activated.
b. genes coding for only crystallin are activated.
c. genes coding for only keratin are activated.
d. genes coding for crystalline and keratin are not activated.
e. apoptosis occurs.
B
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In humans, patterns of inheritance are often studied using which of the following?
A. Dihybrid testcrosses B. Production of true-breeding lines C. Pedigree analysis D. Self-fertilization E. None of the answers are correct
Animal groups differ in the mechanisms by which heartbeats are initiated. Most arthropods have a _______ heart while vertebrates have a _______ heart.
A. neurogenic, myogenic B. myogenic, neurogenic C. neurogenic, cardiogenic D. cardiogenic, myogenic E. autonomous, neurally controlled
A scientific theory will involve four of the following. Which is the exception?
a. subjective conclusions b. carefully stated hypothesis c. repeated controlled experiments d. revisions or rejection if new evidence comes to light e. explanation of a large number of observations
You are a part of the first scientific team to land on Mars. What steps would you take to determine whether there is any life there? If you found something, how would you know whether it is a living thing?
What will be an ideal response?