Which of the following is most likely a regulatory molecule? 

A. hair
B. muscle protein
C. steroid
D. calcium


C. steroid

Biology & Microbiology

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Supercoiling is important for DNA structure, because

A) it holds together the antiparallel strands of DNA in the double helix. B) it provides energy for transcription. C) it condenses the DNA so that it can fit inside the cell. D) it prevents RNA from pairing with DNA in the double helix.

Biology & Microbiology

In a motor unit, a motor neuron is connected with an average of 150 muscle fibers

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

DNA, or deoxyribonucleic acid, is formed from the same organic compounds in all organisms. What do these compounds contain?

A) deoxyribose, a phosphate group, two nitrogenous groups B) ribose, a phosphate group, four nitrogenous groups C) deoxyribose, a phosphate group, four nitrogenous groups D) ribose, a phosphate group, two nitrogenous groups

Biology & Microbiology

What completes preparation of uterus for pregnancy?

A. LH B. FSH C. Prolactin D. Testosterone E. Progesterone

Biology & Microbiology