In this diagram of the heart, A is the ____ and B is the ____
a. AV node; cardiac pacemaker
b. SA node; septum
c. AV node; SA node
d. SA node; AV node
e. septum; cardiac pacemaker
ANSWER: d
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Scientists first focused on gene regulation at the level of translation, rather than transcription, because more was known about protein than nucleic acids at the time.
Answer the following statement true (T) or false (F)
Small polar and charged molecules typically cross the cell membrane by way of ____
a. simple diffusion b. osmosis c. filtration d. active transport e. facilitated diffusion
“Toilet training” children involves their control of the
1.internal urethral sphincter. 2.urinary bladder. 3.kidneys. 4.Bowman’s capsule. 5.external urethral sphincter.
Age-specific mortality is defined as the
A) difference between the number of individuals alive for any age class and the next older age class. B) number of individuals that died during any given time interval divided by the number alive at the beginning of that interval. C) number of individuals from the original cohort who are alive at the specified age. D) probability at birth of surviving to any given age.