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
C
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Crenarchaeotes whose optimal growth temperature is over 80 °C are called
A) hyperthermophiles. B) thermophiles. C) extreme halophiles. D) halophiles.
An example of one of the ways a pH buffer helps to maintain homeostasis is to
A. increase the H+ concentration if pH decreases. B. reduce the H+ concentration if pH decreases. C. reduce the H+ concentration if pH increases. D. increase the OH- concentration if pH increases. E. reduce the OH- concentration if pH decreases.
Bilaterally symmetrical animals
A. have right and left sides when cut longitudinally. B. tend to exhibit cephalization. C. tend to be active and move forward. D. All of the choices are correct.
What structure is produced during meiosis I in the male?
A. secondary spermatocyte B. spermatogonium C. primary oocyte D. immature sperm E. late spermatid