Which of the following is the usual cause of heartburn?
A) backflow of chyme from the stomach into the esophagus
B) retention of food at the bottom of the esophagus by a sphincter that is reluctant to open
C) irritation of the lower esophagus by substances in spicy food
D) compression of the lower esophagus by an overfilled stomach
A
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What is the role of the cap on a sperm's head?
a. It provides directional guidance for sperm in female reproductive tract. b. It provides motility for sperm. c. It provides energy for sperm. d. It provides enzymes to digest outer jelly coat layer of oocyte. e. It provides enzymes to digest sperm body to release nucleus.
In which part of the chloroplasts are the Calvin cycle enzymes located?
A. stroma B. cristae C. grana D. thylakoids E. envelope
Which of the following is likely to have the highest biomass in an ecosystem?
A. grasshopper B. frog C. cow D. grass
Which of the following does not take place in the nucleus?
a. DNA replication b. Translation c. RNA processing d. Transcription