Answer the following questions about DNA replication
A. On a DNA strand that is being synthesized, which end is growing—the 3? end, the 5? end, or both ends? Explain your answer.
B. On a DNA strand that is being used as a template, where is the copying occurring relative to the replication origin—3? of the origin, 5?, or both?
A. The 3? end. DNA polymerase can add nucleotides only to the 3?-OH end of a nucleic acid chain.
B. Both, as a result of the bidirectional nature of chromosomal replication.
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Answer the question using the accompanying figure. In the internal leaf structure, the item labeled "5" is ____
a. a vascular bundle b. spongy mesophyll c. epidermis d. a stoma e. palisade mesophyll
Fossil evidence shows that Tiktaalik had both lungs and gills, indicating that it could
A. absorb oxygen only from the water.
B. take in food for nutrition from the air or the water.
C. absorb oxygen from both air and water.
D. absorb oxygen only from the air.
E. take in food for nutrition through the gills, but breath the air for oxygen.
Describe the difference between incomplete penetrance and variable expressivity. It is often difficult to pinpoint the cause of incomplete penetrance or variable expressivity. What possible interactions may be responsible?
What will be an ideal response?
Availability of water, space and food are all examples of ________ factors that influence the fitness of individuals.
Fill in the blank(s) with the appropriate word(s).