Viral infections can usually be treated with antibiotics
Indicate whether the statement is true or false
FALSE
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The nucleolar organizer is a part of a specific chromosome that directs the synthesis of
A. heterogeneous nuclear RNA (hnRNA). B. ribosomal RNA (rRNA). C. transfer RNA (tRNA). D. messenger RNA (mRNA).
In the vertebrate eye, what structure controls the amount of light that reaches the retina?
A. fovea B. cornea C. iris D. lens E. sclera
If a man and his wife are both homozygous for a disease-causing recessive gene, then
____________________ of their children will be affected. Fill in the blank(s) with the appropriate word(s).
The Japanese puffer fish, a food delicacy, contains the chemical tetrodotoxin (TTX). If too much TTX is ingested, this
can prevent breathing because TTX:a. binds to and activates voltage-activated K+ channels. b. binds to and activates voltage-activated Na+ channels. c. blocks the passage of Ca+ through voltage-activated Ca+ channels. d. blocks the passage of Na+ through voltage-activated Na+ channels. e. blocks the passage of K+ through voltage-activated K+ channels.