What are two typical ratios that result from crossing heterozygotes with homozygous organisms?
What will be an ideal response?
1:1 and 1:1:1:1
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Match each of the proteins involved in DNA replication with its function
a. DNA helicase b. Topoisomerase II c. Single-stranded binding proteins d. DNA polymerase _____ Attaches DNA nucleotides to an RNA primer _____ Unwinds the DNA duplex _____ Relieves the stress on the replication fork caused by unwinding _____ Proofreads the growing DNA strands and replaces mismatched nucleotides _____ Prevents strands of DNA from rejoining after being unwound What will be an ideal response?
Which one of the following is not a steroid that uses a type I receptor?
A. estrogen B. glucocorticoids C. thyroid hormone D. androgens
When is the root-shoot axis established in the flowering plant Arabidopsis?
a. within hours after the seed germinates b. shortly after the eight-cell embryo stage c. during the torpedo stage of embryonic development d. by the first cell division of the embryo
Respond to the following statements in reference to the four structures of the heart listed below.
A. Blood from the superior and inferior vena cava enters the heart via this structure. B. Oxygenated blood enters the heart via this structure. C. Blood is pumped to the majority of the body by this structure. D. Blood passes to the lungs from this structure. E. Deoxygenated blood exits the heart from this structure.