Which of the following is often used to congeal jams and jellies?
a. lignin
b. hemicelluloses
c. pectin
d. cellulose
e. chitin
C
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Many pharmaceutical drugs specifically inhibit transcription in Bacteria but not Archaea or Eukarya. Why would drugs that inhibit transcription only affect Bacteria and not Archaea even though they are both prokaryotes?
A) Archaea and Eukarya have very similar ribosomes that are different than bacterial ribosomes. B) Bacteria lack a nucleus. C) Archaea lack operons. D) Archaea and Eukarya have very similar RNA polymerases that are different than bacterial RNA polymerases.
what do persistent "slow wasting" viral infections do? (kill)
What will be an ideal response?
The stages of mitosis plus interphase are listed below with letters a
through e. Select the correct phase for each statement numbered 70–80. a. interphase b. prophase c. metaphase d. anaphase e. telophase E 70. Homologous pairs of chromosomes line up on the equatorial plate. M 71. Chromosomes replicate. M 72. Genes replicate. E 73. DNA replicates. E 74. Condensation and shortening of chromosomes occurs. E 75. Spindle fibers first appear. M 76. Centromeres break apart as the separated sister chromatids begin to move to opposite poles. E 77. The microtubular spindle develops. E 78. Sister chromatids joined at their centromeres are attached to spindle fibers. M 79. Cytokinesis occurs after this phase of mitosis. E 80. Daughter nuclear membranes form.
Which molecule is responsible for separating double-stranded DNA into single strands?
A. DNA primase B. DNA ligase C. DNA helicase D. single-stranded binding proteins E. topoisomerase