Which of the following excretory tubule segments in mammals consumes the most ATP?
a. distal convoluted tubule
b. Bowman's capsule
c. descending segment of the loop of Henle
d. proximal convoluted tubule
e. ascending segment of the loop of Henle
E
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Why are flexors and extensors considered antagonistic muscles?
A. One muscle group exerts a pulling force while the other exerts a pushing force. B. Both muscle groups exert only a pulling force when they contract, but they produce opposing movements of the joint. C. Hypertrophy of one muscle group induces atrophy of the other muscle group. D. Both muscle groups bend a limb at the joint, but each can only contract while the other extends.
In what way(s) can mRNAs be processed?
A. By adding caps and tails to the ends of the mRNAs B. By splicing the exons (the coding regions) of the mRNAs in different ways C. By removing the introns (the noncoding regions) of the mRNAs D. All of the above are ways in which mRNAs can be processed
The spindle apparatus is composed of
a. Golgi bodies. b. microtubules. c. endoplasmic reticulum. d. nucleoprotein. e. chromatids.
The agent that causes hepatitis D is a viroid that can only reproduce when the hepatitis B virus is also
present. ____________________ Indicate whether the statement is true or false.