Unlike eukaryotic cells, bacterial cells _____
a. have no plasma membrane
b. have RNA but not DNA
c. have no nucleus
d. have no plasma membrane and have no nucleus
C
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Individuals that are heterozygous for sickle-cell anemia are more resistant to malaria than those that do not have a sickle-cell allele. Why does the sickle-cell allele not become fixed in the population?
A. Individuals homozygous for the sickle-cell allele do not have the same resistance to malaria. B. Individuals that are homozygous without the sickle-cell allele produce more offspring than those with the sickle-cell allele. C. Individuals that are homozygous for the sickle-cell allele have sickle-cell anemia, and are at a fitness disadvantage. D. Individuals heterozygous for the sickle-cell allele die earlier than either of the homozygous individuals. E. Analysis indicates the allele is becoming fixed in the population.
Define Ockham's razor and provide an example
What will be an ideal response?
The binding site for an antigen is located in which region of an antibody?
1.Between the variable region of the light chain and the variable region of the heavy chain. 2.Between the variable region and the constant region of the light chain. 3.Between the variable region and the constant region of the heavy chain. 4.Between the constant region of the light chain and the constant region of the heavy chain.
What is the name of the main embryonic cell layer from which the nervous system is derived in most metazoans?
a. endoderm b. mesoglea c. mesoderm d. ectoderm