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.
d
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The enzyme salivary amylase begins the digestion of ________ while food is still in the mouth
a. lipids b. protein c. all of the choices d. starch
Microorganisms show differential sensitivity to antimicrobial agents.
Answer the following statement true (T) or false (F)
Tomatoes carry a gene called fw2.2 that encodes a protein made during early fruit development?the job of which is to repress cell division
Additionally, researchers have identified a second gene called fas that controls the number of compartments in the mature fruit. Artificial selection leading to the production of very large tomatoes has apparently capitalized on ________. A) alleles associated with low production of the repressor protein and an increase in the number of fruit compartments B) alleles associated with high production of the repressor protein and an increase in the number of fruit compartments C) alleles associated with low production of the repressor protein and a decrease in the number of fruit compartments D) alleles associated with high production of the repressor protein and a decrease in the number of fruit compartments
Which of the following would NOT be used to construct a phylogenic tree?
A. homologous structures B. mode of reproduction C. DNA-DNA hybridization D. amino acid sequences