A stage in embryological development which is a solid ball of cells is a
A. gastrula.
B. fetus.
C. blastula.
D. morula.
D. morula.
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Consider the global nitrogen cycle depicted in the figure above. What is the limiting portion of the cycle for plants?
A) industrial nitrogen fixation B) nitrogen lost to the atmosphere C) internal nitrogen cycling in the oceans D) nitrogen fixation by bacteria
Modern cells are thought to have arisen from ____
a. protocells b. pre-cells c. gas and dust clouds d. prokaryotic cells that predated protocells e. prokaryotic cells that predated pre-cells
The descending limb of the loop of Henle is permeable to _______________ but not to _______________
Fill in the blank(s) with correct word
For women with a mutated BRCA gene, the risk of breast cancer is about 60%. However, detection of the mutated gene can occur before cancer ever develops by
A) testing of a blood sample. B) screening mammography. C) taking a biopsy of breast tissue. D) a PET scan. E) urinalysis.