Choose the correct statement regarding the structure of the plasma membrane.
A. The hydrophobic center of the plasma membrane will restrict the movement of fat-soluble substances through the membrane.
B. The membrane is composed of water-soluble molecules, to allow movement of water between the fluid compartments.
C. The movement of proteins in the plasma membrane allows for cellular adaptations to the extracellular environment.
D. Carbohydrates in the plasma membrane can serve as a source of immediate energy for the cell.
Answer: C
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Endocrine disruptors are environmental chemicals, which, if people and other animals are exposed, can have hormone-mimicking or hormone -blocking effects. These chemicals are used in industries and in homes and are associated with such commonly used products as pesticides and herbicides, plastic food containers and baby bottles. Those that mimic or block sex steroids are of special concern,
because they are present in household plastics and are fat-soluble, thus easily stored in fatty tissue of the body and can affect a developing fetus. Research is ongoing and results are controversial, but these chemicals have been associated with: What will be an ideal response?
Label J represents which of the following structures?
A) renal papilla
B) renal columns
C) renal pyramid
D) major calyx
E) minor calyx
The ventral respiratory group
A. is part of the pontine respiratory group. B. is active only in exhalation. C. stimulates the intercostal and abdominal muscles. D. is located in the pons. E. stimulates the diaphragm.
Which statement about excitation-contraction coupling is incorrect?
A) Calcium ion is released from the transverse tubule. B) Calcium ion is released from the sarcoplasmic reticulum. C) Tropomyosin moves to expose myosin binding sites on actin. D) Troponin binds calcium ion and signals tropomyosin to move. E) Relaxation requires uptake of calcium ions by the sarcoplasmic reticulum.