What is the difference between a primary and secondary cell wall in plants?
What will be an ideal response?
A primary cell wall forms on the outside of young plant cells. It is made by cell secretions and cellulose strands. Being thin and pliable, a primary wall allows a growing plant cell to enlarge and change shape.
In some plants, mature cells secrete material (such as lignin) onto the primary wall's inner surface. These deposits form a firm secondary wall. Plant parts with secondary cell walls are stronger, more waterproof, and less susceptible to plant-attacking organisms than younger tissues.
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Four of the five answers listed below are
related. Select the EXCEPTION.
a. lancelet b. jawed fish c. jawless fish d. tunicate e. octopus
Adhering and gap junctions are found
a. at the endoplasmic reticulum. b. at the nuclear membrane. c. at the plasma membrane. d. between Golgi membranes and endoplasmic reticulum membranes. e. between Golgi membranes and vacuole membranes.
Which of the following options best depicts the flow of information when a gene directs the synthesis of a cellular component?
A) RNA ? DNA ? RNA ? protein B) DNA ? RNA ? protein C) protein ? RNA ? DNA D) DNA ? tRNA ? mRNA ? protein
Linnaeus began naming organisms that were alike using Latin names. He gave each organism two names; for example, the pigmy rattlesnake is called Sistrurus miliarius by scientists. What type of naming system is this and what group does "miliarius" designate?
A. Polynomial nomenclature; genus. B. Binomial nomenclature; genus. C. Binomial nomenclature; species. D. Polynomial nomenclature; species.