Which statement is true about prokaryotes?
A. They do not divide by mitosis.
B. They contain a long, linear strand of DNA as the genetic material.
C. They lack ribosomes.
D. They contain a nucleus.
E. They usually lack a cell wall.
Answer: A
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Where does glycolysis takes place?
A. mitochondrial matrix B. mitochondrial membrane C. mitochondrial inner membrane D. mitochondrial intermembrane space E. cytosol
In humans, sickle-cell anemia is caused by an allele that results in abnormal hemoglobin that sickles red blood cells in certain situations. Individuals who are heterozygous for normal and sickle-cell alleles are protected from malaria; homozygous normal has no protection and homozygous sickle-cell has symptoms such as low tolerance for exertion and a shortened life span. This is an example of
A. stabilizing selection. B. directional selection. C. disruptive selection. D. balancing selection. E. cryptic selection.
Which of these groups is least closely related to the
other four? a. green algae b. red algae c. brown algae d. plants e. all of the above are equally closely related
In humans, the presence or absence of dimples is a trait controlled by a single gene. What is the genotype of an individual who is heterozygous for dimples?
A) DD B) Dd C) dd D) DI