In some parts of Africa, the frequency of heterozygosity for the sickle-cell anemia allele is unusually high, presumably because this reduces the frequency of malaria. Such a relationship is related to which of the following?
A) Mendel's law of independent assortment
B) Mendel's law of segregation
C) Darwin's explanation of natural selection
D) the malarial parasite changing the allele
C
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What feature is LEAST characteristic of a virus?
a. contains DNA or RNA genetic material b. contains cytoplasm and ribosomes c. has a protein coat d. can only replicate inside a living host cell e. is very small
Birds are thought to have evolved from
dinosaurs. In considering birds and comparing them to dinosaurs, which of the following would be a derived trait? a. feathers b. legs c. eyes d. toothlessness e. bones
All animals need oxygen gas (O2 ) for their primary cellular-level functioning. Inside the cell, O2 is split apart into oxygen atoms. Eventually, electrons that are flowing through the cell will be "received" by this oxygen
But first, the electrons combine with protons present in the cell to form a basic element that has a single proton and a single electron. Then this element combines with the oxygen to form a certain chemical compound. In this scenario, what chemical compound is produced when this element combines with oxygen? A) Bicarbonate (HCO3 ) B) Water (H2O) C) Carbon dioxide (CO2 ) D) Ozone (O3)
Name the 5 enzymes in exercise 19 and what they catabolize.
What will be an ideal response?