The dynamic scaffolding for many cellular processes
is formed by
a. microfilaments.
b. microtubules.
c. intermediate filaments.
d. myosin molecules.
e. actin molecules.
Answer: b
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Chemical bonds that are formed when one atom with a partial positive charge (created from unequal
sharing of electrons) is electrically attracted to another atom with a partial negative charge (also created from unequal sharing of electrons) are called ____.
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
The RNA world proposal suggests that the first information molecules were
a. transfer RNA. b. ribosomes. c. messenger RNA. d. ribozymes. e. unpaired strands of DNA.
Which of the following is/are advantages of using bacteriophage to treat human bacterial infections?
A. Bacteriophage can kill the bacteria. B. Bacteriophage are very specific for the target bacteria and won't affect normal microbiota. C. Bacteriophage will not cause disease or harm humans. D. All of the choices are correct.
A mutant gene that produces brown eyes (bw) is located on chromosome #2 of Drosophila melanogaster, whereas a mutant gene producing bright red eyes, scarlet (st), is located on chromosome #3. Phenotypically, wild-type flies (with dull red eyes), whose
mothers had brown eyes and whose fathers had scarlet eyes, were mated. The 800 offspring possessed the following phenotypes: wild type (dull red), white, scarlet (bright red), and brown. Most of the 800 offspring had wild-type eyes, whereas those with white eyes were the least frequent. From the information presented above, how many white-eyed flies would you expect in the F2 generation? A) 50 B) 150 C) 350 D) 450 E) 200