Which of the following genera produce numerous useful antibiotics?
A. Leuconostoc
B. Clostridium
C. Helicobacterium
D. Bacillus
Answer: D
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More than ________ % of all T cell precursors that enter the thymus do NOT survive the selection process
A) 15 B) 25 C) 45 D) 95
While neural activity involves transmission of information through electrical events, endocrine activity involves ____
a. transport of hormones to trigger slow, persistent responses b. transport of hormones to trigger fast, transient responses c. release of hormones from exocrine glands for transport outside the body d. changes in neural activity for transport of hormones to target tissues e. transmission of information through chemical reactions
Usually growth of cells that do not pose a threat to surrounding tissues are termed
a. malignant. b. benign. c. metastatic. d. carcinogenic.
The first organisms to colonize land were
A) plants, protists, and insects B) plants, fungi, and insects C) bacteria, plants, and fungi D) protists, bacteria, and fungi