Which of the following statements is FALSE?
A) Carbon, hydrogen, oxygen, and nitrogen are the most abundant elements of living matter.
B) Some naturally occurring elements are toxic to organisms.
C) All life requires the same essential elements.
D) Iron is needed by all humans.
C
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Steroid hormones bind to receptors inside the cell and alter their conformation. The hormone-receptor complex is then transported into the nucleus, where it can directly affect gene expression. To get from the location where the receptor binds the hormone to its site of action, the hormone-receptor complex must _____.
A) undergo another conformational change B) become water soluble by binding to a carrier molecule C) be transported through the nuclear pore complex D) enter the smooth endoplasmic reticulum
Four of the five animals listed below are ectotherms
Select the exception. a. snail b. snake c. spider d. frog e. bird
Which molecules are made during glycolysis?
A) NADH and ATP B) ADP and NADPH C) water and NAD+ D) oxygen and water
Which of the following directly powers the ATP synthase?
a. carbohydrate metabolism b. NADH/FADH2 c. the proton gradient d. electron transfer