Why would an iron deficiency result in anemia?
What will be an ideal response?
ANSWER: A hemoglobin molecule has an iron atom at its center. Therefore, if inadequate amounts of
iron are present, hemoglobin cannot be produced at an adequate rate. Hemoglobin is the
oxygen-carrying substance in an erythrocyte, so a deficiency of hemoglobin results in
anemia.
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Which of the following has X-linked recessive inheritance?
a. Duchenne muscular dystrophy b. phenylketonuria c. achondroplasia d. sickle-cell anemia e. cystic fibrosis
If an error is made during replication that is not caught by DNA polymerase, the most likely is that _____
a. both strands of DNA will be mutated b. only the daughter strand will be mutated c. a mutation that causes cancer will occur d. DNA ligase will repair the mistake before a mutation occurs e. DNA replication will stall indefinitely
Four of the five answers listed below concern cells with two chromosome sets. Select the exception
a. zygote b. somatic cells c. gamete d. diploid e. 46 chromosomes
Spindle fibers are formed during
A. Transcription B. Cell division C. Aerobic respiration D. Protein synthesis E. Photosynthesis