Which of the following are types of myofilaments found in sarcomeres?
Myosin and actin
Sarcoplasmic reticulum and calcium
ATP and calcium
Smooth ER and sarcoplasmic reticulum
A. Myosin and actin
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According to Fig. 9.6, what is a key difference between cell signaling mediated by a surface receptor, compared to that mediated by an intracellular receptor?
A. Cell-surface receptors bind to specific signaling molecules; intracellular receptors bind any signaling molecule. B. Cell-surface receptors typically bind to smaller signaling molecules than those bound by intracellular receptors. C. Cell-surface receptors bind polar signaling molecules; intracellular receptors bind nonpolar signaling molecules. D. Signaling molecules that bind to cellsurface receptors lead to cellular responses restricted to the cytoplasm; signaling molecules that bind to intracellular receptors lead to cellular responses restricted to the nucleus. E. None of these statements about cell signaling differences is correct.
Atoms that gain electrons are now
A. positively charged. B. negatively charged. C. neutral. D. lighter.
What are lymphocytes?
A. Red blood cells B. Cells responsible for clotting C. A specific type of antigen D. White blood cells
Why is meiosis II needed for gamete (egg and sperm) production?
A) to generate genetic diversity B) to make the gametes haploid C) to get unreplicated chromosomes in the gametes D) All of the above are true.