The DNA code for glutamic acid is CTC or CTT. The code for valine is CAA or CAT. In sicklecell hemoglobin, valine is present instead of glutamic acid. Assuming a single base pair substitution has occurred, what is the mRNA code in the affected mutant?
A. CUU
B. GAA
C. GAG
D. GUA
E. GUU
D
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The simplest eye structure, which is able to perceive light but not form an image, is called a
a. compound eye. b. single-lens eye. c. ocellus. d. ommatidia. e. photoreceptor.
Altruism in animals
a. lowers their chances of perpetuating their own genes. b. has no genetic basis. c. is a conscious effort to preserve the species. d. is just lucky behavior. e. includes none of these
If you were able to walk into an opening cut into the center of a large redwood tree, when you exit from the middle of the trunk (stem) outward, you would cross, in order,
a. the annual rings, new xylem, vascular cambium, phloem, and bark. b. the secondary xylem, cork cambium, phloem, and periderm. c. the vascular cambium, oldest xylem, and newest xylem. d. the secondary xylem, secondary phloem, and vascular cambium. e. the summer wood, bark, and phloem.
Which of the following is/are TRUE regarding neurulation?
a. anencephaly and spina bifida are defects that occur during neural tube formation b. neural tube defects are often caused by Vitamin B9 deficiency during development c. neural tube defects are due to over-proliferation of cells d. a and b