Even though plant cell walls in the root system are rigid they are permeable to ________.

a. water and sunlight
b. sunlight and potassium
c. They are not permeable to anything

d. water and ions
e. sunlight and oxygen


d

Biology & Microbiology

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The heart in a human embryo begins to beat about ____ after fertilization

a. 5 days b. 3 weeks c. 7 weeks d. 9 weeks e. 12 weeks

Biology & Microbiology

DNA replication is called ________ because the newly replicated DNA consists of a parental strand (from the original DNA) and a newly synthesized daughter strand

Fill in the blank(s) with correct word

Biology & Microbiology

Which of the following antibiotics inhibits the synthesis of bacterial cell walls?

a. Penicillin b. Streptomycin c. Tetracyclin d. Actinomycin D

Biology & Microbiology

Which of the following is the densest?

A) Liquid water B) Ice C) Steam

Biology & Microbiology