How are the tails and heads of membrane phospholipids oriented in their environment?
A. The hydrophobic heads are oriented towards each other and the hydrophillic tails are oriented towards the extracellular fluid and the intracellular fluid.
B. The hydrophillic tails are oriented towards each other and the hydrophobic heads are oriented towards the extracellular fluid and the intracellular fluid.
C. The hydrophobic tails are oriented towards each other and the hydrophillic heads are oriented towards the extracellular fluid and the intracellular fluid.
D. The hydrophillic heads are oriented towards each other and the hydrophobic tails are oriented towards the extracellular fluid and the intracellular fluid.
C
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While the plant shown here is one that you didn’t study specifically in lab, you should be able to identify it. Is this the gametophyte or the sporophyte of the plant?
What will be an ideal response?
One of the main obstacles to successful cloning of sheep apparently overcome by Wilmut et al. was:a
finding an adult nucleus that was likely to work. b. synchronizing the cell cycles of the donor cell and the egg cell. c. enucleating the donor cell. d. the ability to culture cells in the laboratory. e. recognizing that the nucleus from one sheep cell may contain different genetic information than the nucleus of another cell from the same animal
Which symptoms would arise from a disease that led to the degeneration and death of nerves composed of the peripheral nervous system?
A) inability to memorize names and faces B) severe dementia (loss of intellectual capacity) C) impaired vision D) loss of voluntary muscle control
Which of the following was demonstrated by the Miller-Urey experiment?
A. Life began on the prebiotic Earth 3.5 billion years ago. B. Life began in the oceans. C. Life can be started experimentally in the laboratory. D. Organic molecules important to life could have been formed from a vast array of simple chemicals.