How does the ear distinguish between loud and soft sounds?
What will be an ideal response?
The louder the sound, the more the hair cells are bent. Greater bending leads to higher receptor potentials, leading to more frequent action potentials. Frequent action potentials are interpreted as loudness in the brain.
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In an aqueous environment, the phospholipids of a membrane ____
a. are arranged in a single layer b. are arranged in a bilayer with the polar heads of each layer located at the membrane surface c. are arranged in a bilayer with the fatty acid tails located at the membrane surface d. are arranged in a bilayer but the phospholipids have no specific orientation e. dissociate into their lipid and protein components
__________ are multiple copies of a short DNA sequence that occur at a given locus. Fill in the blank(s) with the appropriate word(s)
There are no cases of -XX or Y individuals, but X individuals do exist. Propose an explanation for this statistic.What will be an ideal response?
Which of the following is the most common type of alternative splicing in animals and involves making mRNA molecules that lack a complete exon?
A) intron retention B) mutually exclusive exons C) alternative splice site D) alternative promoters E) cassette exons