Ctenopores (comb jellies):
A. have a separate mouth and anal pore,
unlike cnidarians.
B. have a separate epidermis and
endodermis, which cnidarians lack.
C. are usually filter feeders that attach
themselves to the ocean bottom.
D. are a type of bilaterian.
A
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Any heritable change in the genetic material is a ____
Fill in the blank with the appropriate word.
Individuals with galactosemia are missing the enzyme galactose -1-phosphate uridyl transferase, resulting in an accumulation of _____ and symptoms including _____
1.galactose / a musty odor 2.galactose-1-phosphate / cataracts and retardation 3.UDP-galactose / urine that darkens upon exposure to air 4.glucose / enlarged thyroid gland 5.galactose-1-phosphate / albinism
Strategies to develop medications to battle Alzheimer's disease have included:
A) infecting transgenic mice with prions B) removal of the AB42 peptide of the amyloid deposits that it produces C) fostering interaction between AB moelcules to generate fibrillar aggregates D) procedures that encourage the formation of the AB42 peptide E) antibiotics that revent replication of prions
Answer the following questions true (T) or false (F)
1. Isotopes differ from each other in the number of protons that they possess. 2. Atoms are electrically neutral. 3. The electrons of an atom contribute significantly to the mass of an atom.