Why is fossil record biased and incomplete?
What will be an ideal response?
ANSWER: Fossilization is more likely to occur in lowland areas where sediments are being deposited,
and so species living in mountainous or dry areas are less likely to fossilize. In addition,
organisms with hard body parts are more likely to fossilize than soft-bodied organisms.
Hence there is a far more complete fossil record of vertebrate evolution than of the
evolution of flowers, for example. Finally, abundant, widespread organisms are more likely
to have been fossilized than rare organisms, or those restricted to very specialized habitats.
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Amino acids that contain many methyl (-CH3) groups
A. are considered hydrophilic. B. are non-polar. C. carry a positive charge. D. carry a negative charge. E. are considered hydrophilic AND carry a positive charge.
A seedling no longer needs its stored food sources once it develops
a. an embryo. b. cotyledons. c. leaves. d. roots.
Integral membrane proteins are differentiated from peripheral membrane proteins due to the fact that integral membrane proteins are ________ while peripheral membrane proteins are ________
a. entirely hydrophilic / entirely hydrophobic b. permanently attached to the bilayer / temporarily attached to one of the bilayer's surfaces c. temporarily attached to one of the bilayer's surfaces / permanently attached to the bilayer d. always either enzymes or receptors / always either active or passive transporters
Which of the following statements about the functions of a plant cell central vacuole is false?
A) The central vacuole of a plant cell may help increase the size of cells by absorbing water. B) The central vacuole of a plant cell may store waste products. C) The central vacuole of a plant cell may digest chemicals for recycling. D) The central vacuole of a plant cell may store poisons.