Practice Questions

TLS Online TPP Program

#Question id: 3252

The unaffected brother of a cystic fibrosis affected girl is referred for genetic counseling. Assume that the population is in Hardy-Weinberg equilibrium. Which of the following is correct? (Cystic fibrosis is an autosomes recessive inheritance with an incidence of 1 in 2500).

#Unit 11. Evolution and Behavior

The probability that the brother is a carrier is 1/2)
If the brother has a child with a healthy unrelated partner the probability that the child will be affected is 1 in 150.
If the brother has a child with his first cousin the probability that the child will be affected is 1 in 12)
If the affected sister has a child with her first cousin the probability that the child will be affected is 1 in 4)

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TLS Online TPP Program

#Question id: 2210

#Unit 2. Cellular Organization

Which of these is a general feature of the lipid bilayer in all biological membranes?

TLS Online TPP Program

#Question id: 2211

#Unit 2. Cellular Organization

Which of these statements about facilitated diffusion across a membrane is true?

TLS Online TPP Program

#Question id: 2212

#Unit 2. Cellular Organization

Membrane lipids may

a. spontaneously flip-flop from one membrane leaflet to the other.

b. move laterally within one membrane leaflet.

c. aggregate with membrane proteins to form lipid rafts.

d. be unequally distributed in the two membrane leaflets.

e. be present in varying amounts in different cellular membranes

TLS Online TPP Program

#Question id: 2213

#Unit 2. Cellular Organization

Which of the following properties is (are) typical of uniport proteins?

TLS Online TPP Program

#Question id: 2214

#Unit 2. Cellular Organization

Which of the following is true about glucose transporters?

TLS Online TPP Program

#Question id: 2215

#Unit 2. Cellular Organization

Which statement describes the mode of action of the ABCB1 transporter (the first eukaryotic ABC transporter to be recognized)?