Why are radioactive isotopes useful in scientific research?
a. Because they are not readily incorporated into biological reactions.
b. Because they are difficult to detect in small amounts but living cells cannot distinguish them from the corresponding stable isotopes
c. Because they can be used as tracers in particular atoms and molecules through metobolic pathways
d. Because they decay sponantaneously and give off energy and subatomic particles.
Ans: a. Because they are not readily incorporated into biological reactions.
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The conducting tissues of vascular plants are rigid because they contain ________ in their cell walls
Fill in the blank(s) with correct word
Allele that exerts its phenotypic effect in the heterozygote; it masks the expression of the recessive allele.
What will be an ideal response?