Vaccination increases the number of _____
A) lymphocytes with receptors that can bind to the pathogen
B) epitopes that the immune system can recognize
C) macrophages specific for a pathogen
D) major histocompatability (MHC) molecules that can present an antigen
A
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Which statement about abiotic factors in aquatic biomes is true?
a. Movement affects the availability of nutrients in both rivers and oceans. b. The numerous photosynthetic organisms in abyssal zones require sunlight. c. Chemosynthetic bacteria are found primarily in brackish water. d. Dissolved solids are found in oceans but not rivers.
Which area of the brain helps to translate thoughts into speech by controlling tongue, throat, and lip muscles?
a. amygdala b. Broca's area c. hypothalamus d. limbic system e. pineal body
After bringing a small plant into the biology lab, you prepare microscope slides of the shoot. Near the tip of the shoot, you observe a dense patch of cells that seem to be actively dividing in a way that would cause the shoot to continue growing in length. This patch of cells is the
A. vascular bundle. B. apical meristem. C. lateral meristem. D. intercalary meristem. E. tracheid.
The cells that become eggs that a woman ovulates at age 40 were initially produced
A. at puberty. B. at her birth. C. when she was a fetus. D. about a month before ovulation.