A continuously varying trait is
A)
cystic fibrosis.
B)
seed color in pea plants.
C)
extra fingers and toes.
D)
weight in humans.
D)
weight in humans.
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Four of the five answers listed below are related by the same gender. Select the exception
a. megaspore b. integuments c. embryo sac d. microspore e. egg
Bananas are propagated by ____
a. grafting b. adventitious roots c. tissue culture d. treating banana tissues with colchicine e. planting seeds
The cell walls of bacteria, fungi, and plant cells and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following is a characteristic common to all of these extracellular structures?
A) They must block water and small molecules to regulate the exchange of matter and energy with their environment. B) They must provide a rigid structure that maintains an appropriate ratio of cell surface area to volume. C) They are constructed of polymers that are synthesized in the cytoplasm and then transported out of the cell. D) They are composed of a mixture of lipids and nucleotides.
The cytoskeleton of cells is made of ________ .
a. carbohydrates b. proteins c. nucleic acid d. phospholipids e. lipids