Recently a methanotrophic proteobacterium was reported that oxidizes methane in anoxic environments by coupling methanotrophy with nitrite reduction, known as ________. In this process of reducing nitrite (NO2-) to nitrogen gas (N2), molecular oxygen is released within the microbe, which it harnesses for methane oxidation.
Fill in the blank(s) with the appropriate word(s).
denitrification
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A(an) _______ is a variation of a gene
A. trait B. character C. gamete D. allele E. variant
One possible explanation for why ____________________ is a primary risk factor for autosomal trisomy is that oocytes remain in meiosis I until ovulation, which could take place many years after birth, making them more susceptible to damage
Fill in the blank(s) with correct word
Two boys survived 6 days at sea without drinking any fresh water. Their plasma antidiuretic hormone (ADH) levels should be ________
a. about the same as normal b. higher than normal c. zero after 6 days d. lower than normal
Which of the following is NOT correct regarding host defenses?
A) First line of defense blocks portals of entry. B) Second line of defense include inflammation and phagocytosis. C) Third line of defense is lymphocyte-dependent and specific. D) Fourth line of defense provides long-term immunity.