Which type of molecular movement is a passive process
A) sodium-potassium pump
B) endocytosis
C) exocytosis
D) diffusion
E) active transport
Ans: D) diffusion
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How does energy coupling allow chemical reactions that are not spontaneous to proceed?
a. the energy from both reactions increases the total free energy b. the energy from the endergonic reaction is transferred to the substrate to stabilize it c. the energy from the endergonic reaction is transferred to the enzyme to stabilize the transition state d. the energy from the exergonic reaction is transferred to the substrate to stabilize it e. the energy from the exergonic reaction is transferred to the substrate to destabilize it
Which of the following is a function of the digestive system?
A. make hemoglobin B. transmit hormonal messengers throughout the body C. search out and destroy foreign substances, including viruses and bacteria D. absorb nutrients E. eliminate nitrogenous waste
Recessive lethals are often mutations in essential genes
Indicate whether the statement is true or false
Which of the following contains a coded message of how to construct a protein?
A. ATP B. tRNA C. ribosome D. mRNA