Which of the following neurotransmitters prepares the body to respond to stress or excitement?
a. acetylcholine
b. dopamine
c. epinephrine
d. serotonin
e. endorphins
C
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The immune system ____
a. works by attacking anything recognized as foreign b. plays no role in fighting cancer c. often accelerates development of malignant cancers d. works by turning off specific genes in an individual's DNA e. is highly resistant to genetic modification
Transcriptionally active chromatin has a large content of ________ proteins, nonhistone proteins associated with chromatin.
Fill in the blank(s) with the appropriate word(s).
Which statement about seedless vascular plants is true?
a. Seedless vascular plants tend to thrive in moist environments. b. Liverworts and horsetails are seedless vascular plants. c. Ferns are the earliest group of seedless vascular plants. d. Seedless vascular plants absorb nutrients through exposed surfaces.
Which of the following statements regarding fungi is false?
A) Fungi are important decomposers in ecosystems. B) Fungi can break down only plant material. C) The distinctive flavor of certain cheeses is due to fungi. D) The first antibiotic discovered came from a fungus.