What structure cements plant cells together?

A. middle lamella
B. hemidesmosomes
C. plasmodesmata
D. primary cell walls
E. adherens junctions


A. middle lamella

Biology & Microbiology

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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.

Biology & Microbiology

About 250 million years ago Earth’s continents merged into one supercontinent called ____

a. Nazca b. Eurasia c. Laurasia d. Gondwana e. Pangaea

Biology & Microbiology

Which of the following are found in freshwater ecosystems?

a. Succulents b. Coral c. Plankton d. Algae

Biology & Microbiology

The space between the cell membrane and the cell wall is important during aerobic respiration.  Why?

A. Pyruvate is transported into the space to be converted into acetyl coenzyme A to enter the Krebs cycle. B. Hydrogen ions are transported out into the space to set up a hydrogen gradient. C. Oxygen combines with electrons in that space to form water. D. Cytochrome electron carriers are located in the space.

Biology & Microbiology