Which statement represents the best explanation for the observation that the nuclear DNA of wolves and domestic dogs has a very high degree of sequence homology? Dogs and wolves _____
A) have very similar morphologies
B) belong to the same order
C) are both members of the order Carnivora
D) share a very recent common ancestor
D
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LUCA, the last universal common ancestor, is:
A. a prehistoric protozoan cell. B. an embryonic cell (in fetus). C. the simplest bacterial cell. D. a cell from which all organisms descended.
Hyaline cartilage is found in
a. intervertebral discs. b. the outer flaps of the ears. c. adipose tissue. d. the trachea. e. in the knee joint.
The genotype Aa is referred to as
a. heterozygous. b. incompletely dominant. c. homozygous recessive. d. homozygous dominant. e. codominant.
Gap junctions in animal cells are most similar to ________ in plant cells?
A. primary cell walls B. hemidesmosomes C. plasmodesmata D. tight junctions E. middle lamella