What event occurs in both anaphase of mitosis and anaphase II of meiosis II?
A) Homologous chromosomes separate.
B) Chromatin decondenses.
C) Homologous chromosomes pair.
D) Cytokinesis ends.
E) Sister chromatids separate.
Answer: E
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During HIV reproduction, spike glycoproteins
A. do not enter the cell with the virus. B. are released into the cytoplasm by cellular enzymes. C. are embedded in the infected cell membrane. D. are assembled into the virus along with reverse transcriptase. E. are embedded in the viral capsid.
Which of the following is NOT a recent discovery that has had a huge impact on the understanding of microbiology?
A. PCR technique B. Restriction enzymes C. Small RNAs D. Biofilms E. All are significant discoveries.
The binding of arabinose to the AraC protein allows it to form a loop in the DNA upstream of the ara operon promoter.
Answer the following statement true (T) or false (F)
Communities with a high level of bacterial diversity are found in many habitats including soil and aquatic environments. Recent studies indicate this diversity is crucial to the functioning of these communities. The same studies have also found that phage abundance plays a critical role in the maintenance of the bacterial diversity within these communities. Are phages a density-dependent or a density-independent regulating factor?
A. density-independent B. density-dependent