Plant cells that are actively dividing are ________ cells
A) differentiated
B) conducting
C) vascular
D) meristem
E) ground
D
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________ are the main primary producers in freshwater environments
A) Phototrophic microorganisms B) Heterotrophic microorganisms C) Chemolithotrophic microorganisms D) Viral microorganisms
Which of the following is true of the structure of the TPP riboswitch only when bound to thiamine pyrophosphate?
A. The conformation of the riboswitch allows the ribosome to access the Shine-Dalgarno sequence. B. The riboswitch folding creates a binding site for the ribosome. C. The riboswitch RNA becomes catalytically active to cleave mRNA. D. The riboswitch is less susceptible to cleavage by ribonuclease.
The failure of chromosomes to separate during
mitosis or meiosis is called a. genetic displacement. b. trisomy. c. crossing over. d. nondisjunction. e. disjunction.
Muscle cells that contract slowly when stimulated but with enormous endurance are called ________
Fill in the blank(s) with correct word