What is the correct order of events that occur during one round of infection by bacteriophage T4?
1) The bacterial cell is lysed.
2) Phage proteins and DNA are synthesized, and bacterial DNA is degraded.
3) New phages are assembled.
4) The phage head proteins enter the bacterial cell.
5) The phage injects DNA into the bacterial cell.
A) 4, 2, 3, 1
B) 4, 5, 2, 1, 3
C) 5, 1, 2, 3
D) 5, 2, 3, 1
E) 4, 5, 3, 1
D) 5, 2, 3, 1
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How does a sarcomere shorten using the sliding filament mechanism of muscle contraction?
A) Actin and myosin filaments shorten and slide past each other. B) As they slide past each other, actin filaments shorten, while myosin filaments do not shorten. C) Actin and myosin filaments do not shorten, but they do slide past each other. D) As they slide past each other, myosin filaments shorten, while actin filaments do not shorten.
Antigens on red blood cells are hereditary traits that allow blood to be typed in different ways. One system is based on a gene with two alleles, M and N. If the frequency of the M allele in a population is 0.4, then according to the Hardy-Weinberg rule, the expected frequency of the heterozygous MN genotype is ________.
A. 0.36 B. 0.16 C. 0.6 D. 0.48 E. 0.24
AZT and Valaciclovir are antiviral nucleoside analogs that interfere with
A) protein synthesis. B) cell wall synthesis. C) cell membrane component synthesis. D) nucleic acid synthesis. E) viral attachment.
Lipids are the only class of macromolecules that contain
A. nucleotides. B. monosaccharides. C. amino acids. D. fatty acids. E. phosphate groups.