17. Of these, which represents a heterozygote? a. aa b. Ab c. AA d. both a. and c. 18. Active transport across a cell membrane is a. moving a molecule from lower to higher concentcation b. moving a molecule from higher to lower concentration c. moving a from outside the cell to inside the cell d. by which cells tet rid of waste products 19. All of the following are true about the cell membrane except _____. a. They are mainly composed of lipids and b. All polar molecules pass freely, directly through the membrane c. They are selectively permeable. d. They have a lipid bilayer 20. Which cellular process produces the most ATP? a. Photosynthesis b. aerobic respiration c. meiosis d. anaerobic respiration 21. A plant can regulate the amount of water in its cells by a. moving to a more aqueous environment b. increasing the amount of solute in the cytoplasm c. reducing its rate of respiration d. drinking a tall glass of refreshing rain water 22. Eye color is represented by the alleles AaBBCc. This is an example of ______. a-complete dominant inheritance b. heterozygote advantage c-sex-linked inheritance d-polygenic inheritance 23. During amniocentesis the baby\'s cells are obtained from the ____. a. fluid around the embryo b. placenta c. uterine wall d. developing embryo Solution 17. Heterozygous is represented by b. Ab 18. Active transport across cell membrane is a. moving molecule from lower to higher concentration. 19. All are true about cell membrane except a. They are mainly composed of lipids. 20. Which cellular process produces most ATP? b. Aerobic respiration 21. A plant can regulate the amount of water in its cells by b. increasing the amount of solute in the cytoplasm. 22. Eye colour represented by the alleles AaBBCc is an example of d. Polygenic inheritance 23. During amniocentesis the baby\'s cells are obtained from the a. fluid around the the embryo.

1. 17. Of these, which represents a heterozygote?
a. aa
b. Ab
c. AA
d. both a. and c.
18. Active transport across a cell membrane is
a. moving a molecule from lower to higher concentcation
b. moving a molecule from higher to lower concentration
c. moving a from outside the cell to inside the cell
d. by which cells tet rid of waste products
19. All of the following are true about the cell membrane except _____.
a. They are mainly composed of lipids and
b. All polar molecules pass freely, directly through the membrane
c. They are selectively permeable.
d. They have a lipid bilayer
20. Which cellular process produces the most ATP?
a. Photosynthesis
b. aerobic respiration
c. meiosis
d. anaerobic respiration
21. A plant can regulate the amount of water in its cells by
a. moving to a more aqueous environment
b. increasing the amount of solute in the cytoplasm
c. reducing its rate of respiration
d. drinking a tall glass of refreshing rain water
22. Eye color is represented by the alleles AaBBCc. This is an example of ______.
a-complete dominant inheritance
b. heterozygote advantage
c-sex-linked inheritance
d-polygenic inheritance
23. During amniocentesis the baby's cells are obtained from the ____.
a. fluid around the embryo
b. placenta
c. uterine wall
d. developing embryo

2. Solution
17. Heterozygous is represented by
b. Ab
18. Active transport across cell membrane is
a. moving molecule from lower to higher concentration.
19. All are true about cell membrane except
a. They are mainly composed of lipids.
20. Which cellular process produces most ATP?
b. Aerobic respiration
21. A plant can regulate the amount of water in its cells by
b. increasing the amount of solute in the cytoplasm.
22. Eye colour represented by the alleles AaBBCc is an example of
d. Polygenic inheritance
23. During amniocentesis the baby's cells are obtained from the
a. fluid around the the embryo