An hypothesis currently getting a lot of attention
concerning the origin of biological molecules is that
they originated
a. in hot springs.
b. near volcanoes.
c. near hydrothermal oceanic vents.
d. in salt lakes.
e. in tidal pools.
Answer: c
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What is a characteristic of T2 bacteriophage?
A. It does not require a host cell for replication B. The phage attaches to the cell wall of a target eukaryotic cell C. The phages injects its DNA into the host cell D. The new phages are formed outside the host cell
The red blood cells of people with sickle cell anemia have abnormal shapes due to ____
a. hemoglobin molecules with mutant beta globin subunits sticking together and forming long fibers in the cytoplasm b. destruction of the hemoglobin molecules c. loss of hemoglobin through leaky cell membranes d. the attachment of phosphate groups to the hemoglobin molecules e. the binding of methyl groups to the heme group of the hemoglobin molecule causing desiccation of the cells
Mendel accounted for the observation that traits which had disappeared in the F1 generation reappeared in the F2 generation by proposing that
A) new mutations were frequently generated in the F2 progeny, ?reinventing? traits that had been lost in the F1. B) the mechanism controlling the appearance of traits was different between the F1 and the F2 plants. C) traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1. D) the traits were lost in the F1 due to blending of the parental traits. E) members of the F1 generation had only one allele for each character, but members of the F2 had two alleles for each character
Why is it INCORRECT to assume that mass extinctions carry only negative impact on the evolution of life on Earth?
A) Mass extinctions are sometimes followed by periods of evolutionary change when other organism groups can flourish and expand in diversity and size. B) Mass extinctions enable scientists to better study embryonic development in two species of organisms and therefore identify possible homology. C) Mass extinctions enable scientists to better study paedomorphosis. D) Mass extinctions disprove Darwin's theory of evolution.