When a leaf is wounded, it releases jasmonic acid. What effect does jasmonic acid have?
a. It lowers the levels of ethylene and hydrogen peroxide.
b. It triggers repair mechanisms within the plant.
c. It triggers a death signal in plant cells near the wound.
d. It increases transcription of genes whose products include a number of volatile chemicals that the plant releases into the air.
e. It increases transcription of hundreds of genes whose products confer general hardiness to the plant.
d
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What components of eukaryotic cells leave a fossil record?
A. organelles B. nuclear membranes C. cell walls D. None of these choices are correct.
An egg's polarity determines the orientation of body axes
Indicate whether the statement is true or false.
One parent carries a dominant allele (AL) that is lethal in early life in homozygotes. The other parent is homozygous for the wild type allele (A+) of the same gene. What is the expected dominant:wild type phenotype ratio for their offspring?
A) 100:0 B) 75:25 C) 50:50 D) 25:75 E) 0:100
Which of the following is found in RNA but not DNA?
A) adenine B) cytosine C) deoxyribose D) guanine E) uracil