The plant tissue responsible for producing cells that thicken roots and stems is the

A. vascular bundle.
B. intercalary meristem.
C. apical meristem.
D. lateral meristem.
E. tracheid.


D. lateral meristem.

Biology & Microbiology

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The hydrophobicity of the planar nitrogenous ring structures of a nucleotide, leading to the exclusion of water and stability of DNA, is referred to as:

A. Watson-Crick base pairing. B. supercoiling. C. base-stacking interactions. D. complementarity. E. polarity.

Biology & Microbiology

Diploid (2n) cells in the ____ of mosses, ferns, gymnosperms, and angiosperms divide meiotically and form haploid (1n) spores

Fill in the blank with the appropriate word.

Biology & Microbiology

Diphtheria is considered to be an upper respiratory tract infection.  However, it can have a very high mortality rate if not caught early and treated.  Predict why this is so.

A. The patient cannot eat or drink and so basically starves to death. B. It makes a toxin that can be carried in blood and produce organ damage, particularly the heart. C. It successfully hides from the immune system of the patient. D. The bacterium moves from the throat to the brain, causing strokes to occur.

Biology & Microbiology

Regarding the order Rhizobiales of the class Alphaproteobacteria, which genus includes human pathogens?

a. Agrobacterium b. Bradyrhizobium c. Beijerinckia d. Brucella

Biology & Microbiology