Photoautotrophs use the energy stored in the products of photosynthesis directly to run the diverse reactions that sustain life
1.True
2.False
2
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Chloroplasts are the site of ____
a. DNA synthesis b. cellular digestion c. protein synthesis d. photosynthesis e. lipid synthesis
What characteristic is unique to echinoderms?
A) a lack of segmentation B) a water vascular system C) radial symmetry D) larvae with bilateral symmetry
Which statement about human reproduction is correct?
A) Fertilization occurs in the uterus. B) In humans, spermatogenesis and oogenesis function best at normal, core body temperatures. C) A human oocyte completes meiosis after a sperm penetrates it. D) The earliest stages of spermatogenesis occur closest to the lumen of the seminiferous tubules.
Acetylcholine (ACh) is released by motor neurons and binds to receptors on muscle cells to initiate action potentials. Some snake venom contains specific toxins that bind irreversibly to these receptors and block acetylcholine's ability to bind. If an
animal is bitten by a snake with these toxins in its venom, what do you predict would happen? A) The animal's muscle cells would increase production of myoglobin. B) The animal's muscles would contract uncontrollably. C) The animal's muscles would not be able to contract. D) The animal's muscle cells would show shrinkage in mitochondria.