17. Of these, which represents a heterozygote? a. aa b. Aa c. AA d. both a. and c. 18. Active transport across a cell membrane is a. moving a molecule from lower to higher concentration b. moving a molecule from higher to lower concentration c. moving a molecule from outside the cell to inside the cell d. a method by which cells get rid of waste products 19. All of the following are true about the cell membrane except _____. a. They are mainly composed of lipids and proteins 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.The word \'hetero\' itself means different and zygote means an eukaryotic cell formed by a fertilization event between two gametes.The answer is (b) as there are two different alleles A and a. 18.a)moving a molecule from lower to higher concentration. When the movement of molecules across acell membrane from a region of their lower concentration to aregion of their higher concentration in the direction against some gradient or the other obstructing factor this is called active transport. 19.(b)All polar molecules pass freely,directly through the membrane. The cell membrane allows only selective molecules to pass,which are required to the membrane. 20.(aerobic respiration) Beccause the majority of ATP is produced in the mitochondria during aerobic respiration. 21.(b)increasing the amount of solute in the cytoplasm because the stomata opens up and aquire the water and stores it.The amount of water in the cells get regulated by increasing the amount of solute in the cytoplasm. 22.(d)Polygenic inheritence As the capital letters are indicated as dominant.Here A has appeared once,B has appeared twice and C has appeared once ,which becomes a dominant allele as there are less recessive characters. 23.(a)Fluid around the embryo Which has cell of the baby and help in diagnosing,whether the baby is a male or female by chromosomal detection..

1. 17. Of these, which represents a heterozygote?
a. aa
b. Aa
c. AA
d. both a. and c.
18. Active transport across a cell membrane is
a. moving a molecule from lower to higher concentration
b. moving a molecule from higher to lower concentration
c. moving a molecule from outside the cell to inside the cell
d. a method by which cells get rid of waste products
19. All of the following are true about the cell membrane except _____.
a. They are mainly composed of lipids and proteins
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.The word 'hetero' itself means different and zygote means an eukaryotic cell formed by a
fertilization event between two gametes.The answer is (b) as there are two different alleles A and
a.
18.a)moving a molecule from lower to higher concentration.
When the movement of molecules across acell membrane from a region of their lower
concentration to aregion of their higher concentration in the direction against some gradient or
the other obstructing factor this is called active transport.
19.(b)All polar molecules pass freely,directly through the membrane.
The cell membrane allows only selective molecules to pass,which are required to the membrane.
20.(aerobic respiration)
Beccause the majority of ATP is produced in the mitochondria during aerobic respiration.
21.(b)increasing the amount of solute in the cytoplasm
because the stomata opens up and aquire the water and stores it.The amount of water in the cells
get regulated by increasing the amount of solute in the cytoplasm.
22.(d)Polygenic inheritence
As the capital letters are indicated as dominant.Here A has appeared once,B has appeared twice
and C has appeared once ,which becomes a dominant allele as there are less recessive characters.
23.(a)Fluid around the embryo
Which has cell of the baby and help in diagnosing,whether the baby is a male or female by
chromosomal detection.