Which of the following is a role of the placenta during pregnancy? (Select all correct choices.)
A. nutrient exchange between maternal and
fetal blood
B. gas exchange between maternal and fetal
blood
C. waste exchange between maternal and
fetal blood
D. estrogen secretion to maintain uterine
lining
E. progesterone secretion to maintain uterine
lining
A,B,C,D,E
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Rhizobium and Bradyrhizobium are significant contributors to which process when engaged in a symbiotic relationship with leguminous plants?
A. Sulfate reduction B. Denitrification C. Nitrification D. Nitrogen fixation
How is life defined?
A) The only requirement for life is the ability to reproduce. B) Life is defined through a set of shared characteristics that all living things display. C) A living thing must be able to move. D) Life is determined by neural activity.
Arrange the following in order from smallest to largest.
a. Nucleoside, nucleotide, genome, gene b. Nucleoside, nucleotide, gene, genome c. Genome, gene, nucleotide, nucleoside d. Gene, nucleotide, genome, nucleoside e. Nucleotide, nucleoside, gene, genome
Thiamin, riboflavin, and niacin play an important role in assisting enzymes involved in _____ metabolism
Fill in the blank(s) with the appropriate word(s).