All the members of a single species that occupy a particular area at the same time are known as a
A. sub-population.
B. gene pool.
C. group.
D. subspecies.
E. population.
Answer: E
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Which of the following is likely required to initiate cell differentiation during development?
A. cell division B. the presence of certain mRNAs needed for expression of cell-specific proteins C. the buildup of cell-to-cell adhesion molecules D. the presence of carbohydrates E. hydration of the egg during fertilization
Match the letter of each example from childbirth to the appropriate component of a positive feedback loop.A. pituitary gland secretes oxytocin, which acts on the uterusB. uterine contractions increaseC. fetus is pushed against uterine openingD. receptors detect stretchE. brain receives and compares stretch informationStimulus
What will be an ideal response?
Which example does not include a case of phenotypic variance?
A. A population of finches has their bill size increased by directional selection B. A population of humans in which individuals differ in height C. A population of bacteria is polymorphic for a single nucleotide polymorphism that resulted from a synonymous mutation D. A genetically uniform population of barnacles express more muscular reproductive organs in wavy environments E. A population of garter snakes with several color patterns use different escape behaviors
Which parasite is commonly transmitted to humans through uncooked beef, lamb, or pork and through infection from cats, which serve as obligate hosts?
a. Cyclospora cayetanensis b. Leishmania spp. c. Toxoplasma gondii d. Trypanosoma brucei