Heterozygote advantage refers to the tendency for heterozygous individuals to have better fitness than homozygous individuals. This higher fitness results in less genetic variation in the population.
a. true
b. false
Ans: b. false
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Many of the enzymes found in virus particles are
A. involved in viral entry into host cells. B. involved in the replication of viral nucleic acid. C. required for viral attachment to host cells. D. All of the choices are correct.
In order for homeostasis to be maintained a(n) ________ must detect a specific stimulus
a. affector b. sensory receptor c. gland d. sensory affector e. effector
Humans have a gene called PDHA1, which codes for one protein that functions as an enzyme in the cell. It helps energy pathways by modifying pyruvate molecules into acetyl CoA molecules. Researchers have identified an insertion mutation in the gene, which produces an extra amino acid within the otherwise normal sequence in the protein. In this type of mutation
A. the mutation is not in DNA, but in the protein. B. the codon that mutates causes a stop codon to occur instead of the placement of an amino acid. C. the codon that mutates causes a change in the amino acid specified. D. the mutation does not occur in an existing codon. E. the mutation may be caused by an addition of three nucleotides.
Which type of proteins is embedded in the cell membrane in both active transport and facilitated transport?
A. cytoskeletal B. structural C. targeted D. carrier