The first photosynthetic organisms to obtain hydrogen by splitting water were the cyanobacteria
______________ Indicate whether the statement is true or false.
True
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Each adenine-thymine base pair has ________ hydrogen bonds, while each guanine-cytosine base pair has ________ hydrogen bonds
A) two / one B) two / three C) four / three D) three / two
Which of the following represents the correct order of structures from outside to inside for a stem that
has a vascular cylinder?
a. stele, cortex, epidermis, pith b. epidermis, pith, cortex, stele c. cortex, stele, pith, epidermis d. epidermis, cortex, stele, pith e. stele, epidermis, pith, cortex
Which of the following is a true statement about proteins?
A. Proteins are used to insulate the body from cold and protect it from abuse. B. Extra proteins are stored in the liver and brain. C. Proteins are made up of amino acids bonded together. D. Proteins are used to produce ATP for the cell. E. Even small changes in temperature and pH will immediately destroy a protein's shape and function.
Contact points between nonsister chromatids that mark the locations of DNA-strand exchange are called __________
A) synaptonemal complexes B) metaphase plates C) chiasmata D) kinetochores E) centrosomes