The bacterium Escherichia coli comprises a significant fraction of the bacterial population in healthy adult humans, ranging from 10-50%
Indicate whether the statement is true or false.
Answer: FALSE
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During in vitro fertilization, the fertilized egg ____
a. is enucleated and fused with a donor egg b. develops in a Petri dish to form an embryo containing 64 to 128 cells c. develops in a Petri dish to form an embryo containing four to eight cells d. develops in the host animal and eventually results in a clone born to the host e. undergoes a second fertilization with a donor animal’s sperm
During respiration in a eukaryotic cell, reactions of the Citric Acid cycle occur in _____.
a. the interior of the mitochondrion b. across the inner membrane of the mitochondrion c. the cytosol d. the inner mitochondrial membrane e. the fluid within the mitochondrion
Tissue transplantation has been made possible by our ability to
A) competitively inhibit HLA molecules. B) alter the expression of the HLA molecules. C) inhibit the binding of helper T cells to the HLA. D) closely match HLA molecules between individuals. E) inhibit interleukin-5.
Why do we have storage macromolecules, such as fats, in our bodies?
A. Human cells can directly capture the energy of sunlight through photosynthesis and store it as macromolecules such as fats. B. We can break down these macromolecules to provide energy for the endergonic reactions in our bodies. C. Breaking down macromolecules, such as fats, is an endergonic process. D. Macromolecules, such as fats, are a convenient way to store kinetic energy.