Which of the following membrane activities requires energy from ATP?
A) facilitated diffusion of chloride ions across the membrane through a chloride channel
B) movement of Na+ ions from a lower concentration in a mammalian cell to a higher concentration in the extracellular fluid
C) movement of glucose molecules into a bacterial cell from a medium containing a higher concentration of glucose than inside the cell
D) movement of carbon dioxide out of a paramecium
B
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The most serious type of mutation is a ________ mutation.
A. frameshift B. point C. silent D. back
Inhibition of the flexor muscle during the knee-jerk reflex is an example of:
A. negative feedback. B. homeostasis. C. reciprocal inhibition. D. All of the answer options are correct.
What is the correct order of events in regards to the birth process? a. Cervical canal dilates - contractions propel the fetus through the cervix- amnion ruptures
b. Cervical canal dilates - amnion ruptures - contractions propel the fetus through the cervix. c. Amnion ruptures - lactation begins - contractions propel the fetus through the cervix. d. Amnion ruptures - cervical canal dilates - contractions propel the fetus through the cervix. e. Lactation begins - contractions propel the fetus through the cervix - amnion ruptures.
Which of these leukocytes are the most abundant and begin to phagocytize pathogens to reduce the spread of infection?
A) basophils B) eosinophils C) neutrophils D) monocytes