Which of the following cells are alive at maturity?
a. sieve tube members
b. vessel members
c. tracheids
d. fibers
e. sclereids
ANSWER: a
Biology & Microbiology
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Which of these hormones can diffuse through the plasma membrane?
a. polypeptide b. epinephrine c. thyroxine d. norepinephrine
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Some terrestrial plants use bicarbonate (HCO3-) as a carbon source for photosynthesis
Indicate whether the statement is true or false
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A(n) (acidic/metallic/fluorescent) molecule is one that absorbs invisible radiation and emits visible light.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
Polypeptide chains are synthesized from _____ instructions by _____.
A) mRNA, ribosomes B) mRA, lysosomes C) tRNA, DNA D) tRNA, ATP
Biology & Microbiology