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TLS Online TPP Program

#Question id: 29554

One important difference between the anatomy of roots and the anatomy of leaves is that__

#XL - R Botany
  1. only leaves have phloem and only roots have xylem.
  2. the cells of roots have cell walls and leaf cells do not.
  3. a waxy cuticle covers leaves but is absent in roots.
  4. vascular tissue is found in roots but is absent from leaves.
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TLS Online TPP Program

#Question id: 56

#XL - Q Biochemistry

Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants?
TLS Online TPP Program

#Question id: 2665

#XL - T Zoology

A transposon ____________.
TLS Online TPP Program

#Question id: 55

#XL - Q Biochemistry

The standard free energy change for the reaction A → B is −15.0 kJ · mol−1. What is the equilibrium constant for the reaction at 25°C?
TLS Online TPP Program

#Question id: 5752

#XL - R Botany

base change that changes a codon for an amino acid to a stop codon
TLS Online TPP Program

#Question id: 365

#XL - S Microbiology

Water is a polar molecule: the oxygen atom with its unshared electrons carries a partial negative charge (δ−) of ___________, and the hydrogen atoms each carry a partial positive charge (δ+) of __________, where e is the charge of the electron.