Ionizing radiation can produce which of the following?
A. cytosine
B. free radicals
C. stop codons
D. thymine dimers
E. hypoxanthine
B. free radicals
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Recent evidence suggests that hydrogenosomes and mitochondria evolved from different endosymbiotically derived organelles.
Answer the following statement true (T) or false (F)
Mendel performed a testcross with his plants and all the resulting progeny had the same colour. What information did this testcross provide?
a. The parent with the dominant trait is heterozygous. b. The parent with the dominant trait is homozygous. c. The parent with the recessive trait is heterozygous. d. The parent with the recessive trait is homozygous.
What kind of enzyme adds a phosphate group to another protein?
A.) kinase B.) phosphorylase C.) ATPase D.) phosphatase E.) GTPase
Which of the following environmental conditions is likely to enhance photorespiration?
A. a ratio of CO2 to O2 that favors CO2 B. conditions that cause the stomata to open C. plants growing far apart D. a hot, dry environment E. darkness