The density of air increases with:
a. increasing temperature.
b. decreasing pressure.
c. increasing moisture.
d. decreasing moisture.
D
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In a eukaryotic cell, a gene that is initially transcribed is 1500 nucleotides in length. The mature mRNA for the product is 1200 nucleotides in length. What is the most probable reason for the discrepancy?
A) a mutation that results in a shorter product B) removal of introns C) removal of exons D) mRNA breakage E) both choices A and D
Which of the following statements about the egg cell is false?
a. It is relatively small compared to other body cells. b. It contains a haploid nucleus. c. It contains lipids. d. It contains mitochondria. e. It is located in a follicle.
Which of these is most abundant in the plasma membrane?
A) proteins B) carbohydrates C) cholesterol D) phospholipids
What is NOT a component of the translation machinery?
A. protein polymerase B. mRNA C. translation factors D. ribosomes E. tRNA