Why are flexors and extensors considered antagonistic muscles?
A. Both muscle groups bend a limb at the joint, but each can only contract while the other extends.
B. Both muscle groups exert only a pulling force when they contract, but they produce opposing movements of the joint.
C. One muscle group exerts a pulling force while the other exerts a pushing force.
D. Hypertrophy of one muscle group induces atrophy of the other muscle group.
Answer: B
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A) Xenobiotics were designed to inhibit microbial growth. B) Some xenobiotics are novel compounds that differ from naturally occurring chemicals, thus microorganisms have not yet evolved to effectively degrade them. C) Only cometabolic microbial processes degrade xenobiotics. D) Chlorinated compounds are so toxic that biodegradation is not possible.
Which of the cytoskeletal filaments is associated with providing the cell with mechanical strength?
A. microtubules B. microfilaments C. microtubules and microfilaments D. intermediate filaments
What type of cell does HIV infect?
A. helper T cells B. B cells C. red blood cells D. phagocytic cells E. All of the answer choices are correct
All animals need oxygen gas (O2 ) for their primary cellular-level functioning. Inside the cell, O2 is split apart into oxygen atoms. Eventually, electrons that are flowing through the cell will be "received" by this oxygen
But first, the electrons combine with protons present in the cell to form a basic element that has a single proton and a single electron. Then this element combines with the oxygen to form a certain chemical compound. In this scenario, what chemical compound is produced when this element combines with oxygen? A) Bicarbonate (HCO3 ) B) Water (H2O) C) Carbon dioxide (CO2 ) D) Ozone (O3)