During neuronal signaling, a change in membrane potential will cause sodium channels to open and let Na+ ions diffuse down their concentration gradient into the cell. Which of the following helps establish the concentration gradient necessary for this process to occur?
A. Na+/K+ channel
B. voltage-gated Na+ channel
C. Na+ symporter
D. Na+/K+ pump
D. Na+/K+ pump
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Which is most likely to happen to a human polyploid?
a. natural abortion b. death around the age of 1 year c. survival until the early teens d. survival until the mid-thirties e. death around the age of 1 month
Colonic Fermentation
What will be an ideal response?
If an allele is dominant, then:a
its phenotype is only expressed in heterozygous individuals. b. its phenotype is expressed only in homozygous individuals.. c. one allele can mask the expression of a recessive allele in a hybrid. d. its phenotype is always expressed in all generations. e. its phenotype is more beneficial than the recessive phenotype.
Thylakoids are found in
A. chloroplasts B. mitochondria C. liver cells D. fungal cells