If a pedigree of several generations shows only females affected by a particular trait, it cannot be a(n) ____ trait
a. autosomal recessive
b. autosomal dominant
c. Y-linked
d. X-linked recessive
e. X-linked dominant
c
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Which immune system cells primarily function as antibody producers and originate from stem cells?
a. B lymphocytes b. T lymphocytes c. Natural killer cells d. Neutrophils
What makes phospholipids good at forming cellular membranes?
A. Regions of aliphatic and hydrophilic atoms causing an internalization of phosphorous making a bilayer. B. The polar and non-polar regions create an amphipathic bilayer of phospholipids. C. Covalent and ionic bonds between glycerols create a tight seal around the cell. D. The three saturated fatty tails in phospholipids create a semi solid like structure that maintains a cell's shape.
The slender stalk that connects the flattened leaf blade to the stem in most dicots is the
A. meristem. B. petiole. C. stele. D. receptacle. E. vein.
Two types of polygamy are:
a. kin selection and reciprocal altruism. b. polygyny and polyandry. c. polygyny and monogamy. d. internal and external. e. isogamy and anisogamy.