The lineages Anura, Caudata, and Gymnophiona are all part of which of the following group?
a. Testudines
b. Archosauromorpha
c. Squamata
d. Sphenodontia
e. Amphibia
E
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There are cases, particularly in fruit flies, in which a normal body part grows in the wrong spot. For instance, legs on the head growing instead of antennae, or a second set of wings behind the normal pair. What can explain this?
A. These are due to the reappearance of stem cells, which are totipotent. B. These are due to misregulation of hormones from environmental contamination with pesticides. C. These occur as a result of mutations in homeotic genes, which normally act to direct development along the anterior-posterior axis. D. These naturally occur sometimes in animals that have metamorphic development, due to different organization of homeotic gene expression in larvae versus adults.
Which of the following is not associated with mRNA processing in eukaryotes?
A) addition of a 5' methyl guanosine cap B) 3' polyadenylation C) removal of introns D) removal of exons
. What skeletal features differentiate modern humans from apes, and what common purpose do all these differences
serve? What will be an ideal response?
Many of the known cancers are a result of ________
A) the genetic instability of the human genome B) the non-carcinogenic nature of our environment C) the genetic stability of the human genome D) exercising regularly