Two organisms that are classified in the same family would not necessarily be classified in the same:
Answer(s): E
Because a "family" is more highly classified than kingdom, phylum, class, and order, organisms that share the same family must also share the same kingdom, phylum, class, and order. Only the genus of the two organisms may differ.
Plasma B cells are essential in the human immune response because of their ability to
Answer(s): A
Plasma B cells are specialized immune system cells that secrete antibodies, small Y-shaped proteins that can directly attach to and agglutinate, or clump, invading bacteria. Attaching directly to cells is the job of killer-T cells, and engulfing pathogens is the job of macrophages. Clotting is done primarily by platelets and other protein fibers.
The first vertebrates to live on land were the amphibians, characterized by their ability to
Answer(s): B
Amphibians are characterized by their ability to breathe through moist skin (in addition to small lungs) and to walk on four limbs. The do not have rough, scaly skin or lay hard-shelled eggs like their reptile descendants, nor can they run quickly on land with muscular limbs (also like reptiles). Mammals are set apart by their milk-producing abilities.
Fossils of an ancient reptile called Lystrosaurus have been found in Africa, India, and Antarctica. Which of the following best explains this distribution?
Answer(s): C
The best evidence to support the finding of fossils on widely separated land masses comes from continental drift theory, which states that certain land areas had been connected and slowly drifted apart this would allow for separation of what were once continuous species' ranges. It is highly unlikely that a reptile species could have moved easily between continents or could have survived frozen seas during the Ice Ages.
Gregor Mendel identified "factors'" that could be passed down from parents to offspring and that resulted in the expression of certain characteristics. Today, we call Mendel's "factors"
Different forms of the same gene are called alleles. For example, B (brown) and b (blue) are two different possible eye color alleles in humans. No other answer choices fit the definition of a "factor" that results in the expression of a certain characteristic.
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