题目内容

A compound that speeds the rate of a metabolic reaction is a(n):

A.gene
B.salt
C.mineral
D.enzyme

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The substance that makes up the cell’s genetic material is:

A.DNA
B.protein
C.acid
D.base

Chemicals, cells, tissues, , systems, organism. What belongs in the blank?

A.organs
B.genes
C.enzymes
D.nuclei

The root that means “cell” is:

A.spher
B.cyt
C.fibr
D.gen

The root that means “tissue” is:

A.hist
B.cellul
C.cyst
D.hem