Which enzyme activity is associated with the proofreading mechanism of DNA polymerase I?
A) 5'-to-3' exonuclease activity
B) 3'-to-5' exonuclease activity
C) 5'-to-3' polymerase activity
D) Both A and B
E) All of these
B
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Which group of adult tissues is derived from the mesoderm?
a. lining of the digestive tract, liver, pancreas b. muscles, bones, cartilage c. skin, brain, retina d. skin, liver, pancreas e. lining of respiratory tract, thyroid gland, urinary bladder
Mycorrhizae are
a. intertwined roots of different species of plants. b. connecting points between branching roots. c. symbiotic associations between a fungus and plant roots. d. specialized root hairs. e. localized swellings in plant roots filled with nitrogen-fixing bacteria.
In most flowering plants, one sperm nucleus fuses with an egg forming a zygote that develops into an embryo. Another sperm nucleus fuses with ____
a. the endosperm mother cell to produce three cells, each with one nucleus b. the endosperm mother cell, forming a diploid cell c. the endosperm mother cell, forming a triploid (3n) cell d. one of the smaller megaspores to produce what will eventually become the seed coat e. one of the smaller megaspores to produce a diploid endosperm
A new antibiotic is produced that inhibits the synthesis of acetyl-CoA and the electron transport chain in bacteria. For each glucose molecule that is metabolized, how many fewer ATP molecules will be produced?
a. 4 b. 2 c. 38 d. 36 e. 34