Polyadenylation adds a tail of____ to the mRNA
Fill in the blank(s) with the appropriate word(s).
Answer: adenines
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__________ pathogens obtain resources from living cells, whereas __________ pathogens kill cells before colonizing them
A. Biotrophic; necrotrophic B. Necrotrophic; biotrophic C. All bacterial; all fungi D. All fungi; all bacterial E. Asymptomatic; symptomatic
During gastrulation, the cellular process by which ectoderm in the animal pole spreads toward the vegetal pole is called
A. epiboly. B. invagination. C. involution. D. convergent extension. E. apical constriction.
Which of the following is true of plant cells?
A) Plant cells may contain chloroplasts. B) Plant cells are always much larger than animal cells. C) Chromosomes are found only in plant cells. D) Only plant cells have a cell membrane. E) The plant cell has no cell wall.
The electrical stimulus for each human heartbeat begins in the
A. left atrium at the sinoatrial node. B. right ventricle at the atrioventricular node. C. pulmonary trunk at the sinoatrial node. D. right atrium at the atrioventricular node. E. right atrium at the sinoatrial node.