Why is only one strand of DNA transcribed into mRNA?
a. Because mRNA is only required in small quantities.
b. Because transcribing both DNA strands would produce different amino acid sequences.
c. Because the other strand would produce the same amino acid sequence in reverse order.
d. Because all genes are located on the same DNA strand, while the other strand acts as
protection.
e. Because the other strand is transcribed directly into amino acids.
B
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Some essential genes and DNA sequences in cells DO NOT encode for proteins but are still essential for cellular growth and replication. Give two examples of a gene or sequence of which this is true and explain why it is essential for growth or replication
What will be an ideal response?
Now, time rolls inexorably along. One hundred thousand years after the original event, yet more rodent-philic descents return to the island and repeat the sampling process
There are now twice as many fixed differences between A1 and A2, relative to the 50,000 years after vicariant event table. Unlike last time, you find that individuals from A1 cannot reproduce with individuals from A2. Compare the DNA sequences presented above and give the amount of variation expected: ...between two randomly chosen individuals of A1. A. relatively low variation B. moderate variation C. relatively high variation
The infective larvae of the parasite S. stercoralis penetrate the skin and migrate through the circulatory system to the heart and lungs. The organism enters the bronchial tree and is then swallowed, entering the digestive tract, where the organism matures into an adult worm. This parasite is classified as which type of infection?
a. Pinworm b. Threadworm c. Whipworm d. Hookworm
The root tip is indicated by
a. A. b. B. c. C. d. D. e. E.