Scientific research companies sell kits that allow researchers to produce proteins in test tubes via a process known as "in vitro translation." Which one of following components is NOT needed in these kits?
A) amino acids
B) transfer RNA
C) DNA
D) ribosomes
C
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B cells are more effective than macrophages in presenting antigens to activate T cells when
A. antigen concentrations are low. B. macrophages are in short supply. C. antigen concentrations are high. D. None of the choices are correct.
The thin layer of meristematic cells located between xylem and phloem is referred to as the:a
apical meristem. b. collenchyma. c. cork cambium. d. vascular cambium. e. pith.
Which of the following do proteins and nucleic acids have in common?
A. They are both made of amino acids. B. Their structures contain sugars. C. They are hydrophobic. D. They are large polymers. E. They each consist of four basic kinds of subunits (monomers).
Saline soils have a higher water potential than plant roots.
Answer the following statement true (T) or false (F)