A biologist draws a tree of life having only three branches. Which of the following groups did the biologist most likely choose for her diagram?
A. fungi, eukarya, and vertebrates
B. archaea, bacteria, and eukarya
C. vertebrates, bacteria, and archaea
D. bacteria, fungi, and archaea
E. eukarya, bacteria, and fungi
B
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A mixed solution of water and small molecules is exposed to a cell membrane and allowed to interact for an hour. Which molecule would be most likely to cross the phospholipid bilayer without the aid of transport proteins and diffuse across the membrane the fastest?
A. Water B. NH4+ C. NH3 D. CH3COO- E. Na+
The head of a sperm is covered by the ________, which contains enzymes that help penetrate the layers of cells surrounding the egg
Fill in the blank(s) with correct word
Genes associated with embryonic development are known as
A) homologous genes. B) sigma factors. C) heterologous genes. D) hopanoids. E) homeotic genes.
The organ that secretes bile and destroys worn-out red blood cells:
What will be an ideal response?