Maintenance of the body's internal environment at relatively constant levels is called ____
a. feedback
b. homeostasis
c. physiology
d. natural selection
e. feedforward
ANSWER: b
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Nucleosomes are best described as:
a. eukaryotic DNA associated with histone proteins. b. prokaryotic DNA associated with nonhistone proteins. c. eukaryotic DNA associated with nonhistone proteins. d. prokaryotic DNA associated with histone proteins. e. eukaryotic DNA associated with scaffolding proteins.
In pea plants, the gene for round seeds (R) is dominant, and wrinkled seeds (r) is recessive. The endosperm of the pea is also either starchy, a dominant gene (S), or waxy (s). What can be said of a fully heterozygous, dihybrid cross?
A. Some offspring could be homozygous for both dominant genes. B. Some offspring could be homozygous for one dominant gene such as round seed and homozygous recessive for the other recessive waxy gene. C. Some offspring could be homozygous for both recessive genes. D. All of these choices are impossible combinations in a dihybrid cross. E. All of these choices are possible combinations in a dihybrid cross.
Which characteristic best describes vertebrates?
a. vertebral column b. blood containing hemoglobin c. four-chambered heart d. lungs e. live birth
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