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