In the phylogenetic tree above, which of the following two groups are most closely related?

a. turtles and snakes
b. ray-finned fishes and lobe-finned fishes
c. birds and crocodiles
d. mammals and snakes


C

Biology & Microbiology

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Erythromycin is put in the eyes of newborns specifically to prevent

A) syphilis. B) gonorrhea. C) a chlamydial infection. D) ocular herpes.

Biology & Microbiology

Celiac disease is an autoimmune disorder which destroys the microvilli of the small intestine. Vitamin B12 can be absorbed by passive diffusion across the microvilli of the small intestine. Consider a patient who has had 10% of their microvilli destroyed. If the concentration of vitamin B is 0.6 pg/ml inside the lumen of the small intestine and 0.3 pg/ml on the inside of an epithelial cell, how is the diffusion rate of vitamin B altered in this patient?

A. It is reduced by 10%. B. It is reduced by .003%. C. It is increased by 10%. D. It is reduced by .3%. E. It is increased by .3%.

Biology & Microbiology

Which term refers to muscles that are attached to bones, and cause bones to move at their joints when they contract?  

A.  smooth muscles B.  skeletal muscles C.  cardiac muscles D.  ligament tissues E.  involuntary muscles

Biology & Microbiology

The chemical bonds in DNA by which the sugar components of adjacent nucleotides are linked are called

A. hydrogen bonds. B. peptide bonds. C. phosphodiester bonds.

Biology & Microbiology