At the end of gastrulation, which of the following are produced?
a. hollow balls of cells
b. embryos with germ layers
c. solid balls of cells
d. maternal messages
e. blastocyst
B
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Match the following items with the correct phrases.
_______1. _______2. _______3. _______4. _______5. a. Cryptosporidium parvum b. Ebola virus c. Escherichia coli O157:H7 d. Hantavirus e. Legionella pneumophila
What is the purpose of ionic groups in the active sites of enzymes?
a. to alter the substrate in a way that favors catalysis b. to catalyze an acid/base reaction required for synthesis c. to promote the binding of substrates that otherwise would not fit d. to generate an electronic current to provide the energy for the reaction e. to increase the salt concentration required for the chemical reaction to occur
How do pancake tortoises protect themselves from predators?
a. Their coloration serves as a disguise. b. They emit an undesirable scent. c. They have large jaws with teeth. d. They puff themselves up and become wedged in between cracks in rocks. e. They retreat into their shell.
Which cells are involved in a secondary response?
a. Memory B cells and plasma cells b. Memory B cells c. T cells d. Plasma cells