What is the role of fossils in supporting the theory of common descent?
A) Fossils of dinosaurs show that other types of life existed, but there is no evidence of relationships between them.
B) There have been many fossils of intermediate types discovered that provide strong support for the theory of common descent.
C) There are plenty of fossils to show that animals have evolved, but there are not enough fossils of human ancestors to suggest that humans are related to other animals.
D) Fossil evidence has been found to support the relationship between humans and other primates but only in Europe.
B
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In pea plants, yellow seed color is dominant to green, and wrinkled seed texture is dominant to smooth. In a dihybrid
cross between two heterozygous plants with yellow, round seeds, if the two alleles assort independently, what is/are the predicted phenotypic ratio(s) of the offspring?
a. all are yellow and round b. 8 yellow and round: 8 green and wrinkled c. 9 green and wrinkled: 4 yellow and round: 3 green and round d. 9 green and round: 3 yellow and round: 3 yellow and wrinkled: 1 green and wrinkled e. 9 yellow and round: 3 green and round: 3 yellow and wrinkled: 1 green and wrinkled
Which of the following statements about aromatic amino acids is correct?
A) All are strongly hydrophilic. B) Histidine's ring structure results in its being categorized as aromatic or basic, depending on pH. C) On a molar basis, tryptophan absorbs more ultraviolet light than tyrosine. D) The major contribution to the characteristic absorption of light at 280 nm by proteins is the phenylalanine R group. E) The presence of a ring structure in its R group determines whether or not an amino acid is aromatic.
Atherosclerosis is characterized by
a. increased circulation to the heart b. larger muscles c. a narrowing of the inner walls of coronary arteries due to buildup of fatty materials d. a widening of inner walls of blood vessels as a result of a heart attack
When comparing cell shapes, the presence of which observable structure in plants provided the structural support?
What will be an ideal response?