In the Na+/K+ pump, _____ molecules of sodium are transported and ______ molecules of potassium are transported in each cycle
Fill in the blank(s) with the appropriate word(s).
3, 2
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In which of the following types of organisms would you expect to find a contractile vacuole?
a. sea coral b. lymphocyte c. amoeba d. planaria
In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A lethal recessive allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?
A) 2:1 male to female B) 1:2 male to female C) 1:1 male to female D) 4:3 male to female E) 3:1 male to female
Rotation of the ________ subunit of ATP synthase causes conformational changes in the catalytic sites that produce ATP.
A) alpha B) beta C) gamma D) F0
Among the dihybrid crosses below, which will produce a 1:1 phenotypic ratio?
A) AA BB × aa bb B) Aa Bb × Aa Bb C) Aa Bb × aa bb D) Aa BB × aa BB E) AA bb × aa BB