Which cells in the root have a suberin layer called the Casparian strip?

A. endodermis
B. pericycle
C. cortex
D. epidermis
E. root hair


A. endodermis

Biology & Microbiology

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Water enters the water vascular system of a sea star through a structure called the ____

a. ampulla b. ossicle c. radial canal d. ring canal e. madreporite

Biology & Microbiology

Which of the following types of ecosystems would have the lowest percentage of total net primary

productivity?

a. open ocean b. savanna c. swamp and march d. temperate deciduous forests e. tundra

Biology & Microbiology

In the following reaction, what type of bond is holding the two atoms together? K+Cl ? K+ + Cl? ? KCl

A) hydrophilic B) ionic C) hydrophobic D) covalent

Biology & Microbiology

Which of the following statements is true about epigenetic regulation?

A) Epigenetic regulation changes the sequence of DNA nucleotides. B) Epigenetic regulation is unable to affect a cell's phenotype. C) Epigenetic regulation is completely understood. D) Epigenetic regulation is a way to control protein synthesis. E) DNA methylation is one example of epigenetic regulation that is only found in prokaryotes.

Biology & Microbiology