Vertebrates with a four-chambered heart include
A. fish.
B. nonavian reptiles.
C. birds.
D. amphibians.
E. annelids.
C. birds.
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Dendritic cells
A. contain granules with histamine and other pharmacologically active substances that contribute to the inflammatory response. B. are capable of recognizing specific pathogen-associated molecular patterns and play an important role in nonspecific resistance. C. are mainly important in the defense against protozoan and helminth parasites. D. play an important role in the development of allergies and hypersensitivity.
Is the grey pigment controlled by the same gene as the red pigment?
a. Yes b. No
If two organisms of different species share more similar DNA sequences with each other than with other species, we can conclude that ________
A) these two species are not closely related B) these two species are very closely related C) these two species happen to share similar DNA by chance D) there is no relationship between similar DNA and how closely related organisms are
What is the name of the semi-fluid medium inside the cell?
A. cytoskeleton B. organelle C. nucleolus D. mitochondrion E. cytoplasm