The main reason that mRNA transcripts are modified at the 5' and 3' ends is:
A. to ensure that all nucleotides are phosphorylated.
B. to protect the RNA from nucleolytic degradation.
C. so that the two ends remain associated with each otherduring transport.
D. to guide the removal of introns.
B
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Inheritance is the process by which genetic information is ____
a. transmitted to offspring in the form of RNA b. transmitted to offspring in the form of DNA c. transcribed from DNA into RNA d. transmitted to offspring in the form of proteins e. translated from RNA into proteins
A woman heterozygous for color blindness (an X-linked recessive allele) marries a man with normal
color vision. What is the probability that their first child will be color-blind? a. 25 percent b. 50 percent c. 75 percent d. 100 percent e. 0 percent
According to the fluid mosaic model of cell membranes, phospholipids _____
A) can move laterally along the plane of the membrane B) frequently flip-flop from one side of the membrane to the other C) occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane D) have hydrophilic tails in the interior of the membrane
What feature do the carbon and nitrogen cycles have in common?
A. A large atmospheric component B. Many microbes involved in cycling C. Mostly local cycling D. Often a limiting nutrient E. Involvement in global climate change