Which clinical feature is a common finding for infants with trisomy 21, trisomy 18, and trisomy 13?
A. Rocker bottom feet
B. Single palmar crease
C. Small, close-set eyes
D. Cleft lip (with or without cleft palate)
Answer: B. Single palmar crease
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A person who believes that the universe is at least partially controlled by super natural powers can best be described
(a) teleologist. (b) vitalist. (c) empiricist. (d) mechanist.
Eukaryotic cells regulate the expression of multiple genes by having ____
a. individual activators for individual genes b. a few activators that can interact with small subsets of genes c. activators that serve as catalysts for further activator protein synthesis d. a few activators that work in different combinations to activate different genes
e. a single activator that undergoes modifications to enable interaction with different promotersA hydroxide ion has an oxygen atom
A. only. B. and an extra electron. C. and a hydrogen atom, and an extra electron. D. and a hydrogen atom, and an extra proton.
What is the best explanation of why we have identified only a small fraction of fungi species?
A) Most fungi species grow underground and in inaccessible places. B) Fungi species lack chlorophyll and are transparent. C) Most fungi species are unicellular and microscopic. D) Fungi species have extremely short life spans and are seldom found alive.