Keratins are considered to be obligate heterodimers in that the dimers forming their filaments must contain one __________ and one __________ subunit?
Fill in the blank(s) with the appropriate word(s).
Ans: Type I; type II
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Mr. Johnson was becoming slightly deaf. To test his hearing, his doctor held a vibrating tuning fork tightly against Mr. Johnson's jaw. This sent vibrations through the bones of the skull, setting the fluid in the cochlea in motion. Mr. Johnson could hear the tuning fork this way, but not when it was held away from the skull a few inches from his ear. Where was the hearing problem most likely to
be? A. auditory cortex of Mr. Johnson's brain B. auditory nerve leading to Mr. Johnson's brain C. hair cells in the cochlea D. tympanum or the bones of the middle ear E. fluid of the cochlea
What is the danger of Ug99 to global food production? What will be an ideal response?
Human viruses can enter human cells by fusion with the cell membrane or by:
a. endocytosis. b. diffusion into the cell. c. passage through specific protein channels
d. attaching onto protein signals entering the cell. e. coating themselves with lipids that cloak their entrance into the cell.
Chlorophyll a and the accessory pigments of a photosystem act as an antenna by:
A) absorbing energy from NADPH and passing it on. B) being the primary electron acceptor. C) absorbing energy from sunlight and passing it on. D) absorbing CO2 and passing it on.