Which parts of the atoms interact in a chemical reaction?
A. protons
B. neutrons
C. ions
D. electrons
E. isotopes
Answer: D
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Choose the letter of the best match: Surgical intervention
A. birth control pill B. intrauterine device C. diaphragm D. foams and jellies E. vasectomy
Two groups of tomatoes were grown under laboratory conditions, one with humus added to the soil and one a control without humus
The leaves of the plants grown without humus were yellowish (less green) compared with those of the plants grown in the humus-enriched soil. The best explanation for this difference is that _____. A) the healthy plants used the food in the decomposing leaves of the humus for energy to make chlorophyll B) the humus made the soil more loosely packed, so water penetrated more easily to the roots C) the humus contained minerals such as magnesium and iron, needed for the synthesis of chlorophyll D) the heat released by the decomposing leaves of the humus caused more rapid growth and chlorophyll synthesis
Which of the following structures of the eye does not touch the lens?
A. vitreous humor B. pupil C. suspensory ligaments D. aqueous humor E. cornea
Chromosomes are located on genes.
a. true b. false