Chordates all possess which of the following, at least during embryological development? Select all that apply
A. a notochord
B. a dorsal nerve cord
C. a post-anal tail
D. a bony skeleton
E. jaws
A,B,C
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Which of the following is NOT a characteristic of a morphogen?
A. A morphogen will only elicit effects in areas where it is at a high enough concentration. B. Morphogens are distributed asymmetrically throughout the cell. C. Morphogens can be secreted to act on neighboring cells. D. Morphogens can cause cell death. E. None of these choices are incorrect, they are all characteristics of morphogens.
To produce angiotensin II, what must be secreted from the kidney to convert angiotensinogen to angiotensin I, which is then converted to angiotensin II by angiotensin converting enzyme?
A) renin B) angiotensinogen C) preangiotensin D) vitamin D3 E) erythropoietin
What is the atomic mass of the atom identified as A in the accompanying figure?
a. 2 amu
b. 6 amu
c. 8 amu
d. 12 amu
e. 18 amu
Mutations
A) can be helpful, neutral, or harmful to individuals. B) limit the potential for evolution. C) arise due to environmental pressures. D) are caused by natural selection.