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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology