Which of the following cell structures are present in sieve elements, but not in mature vessel elements? Choose all that apply
A. nucleus
B. mitochondria
C. cell wall
D. cytoplasm
E. smooth endoplasmic reticulum
B,D,E
Biology & Microbiology
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The process of photosynthesis involves the conversion of:
a. oxygen and water into sugar. b. sugar into starches and cellulose. c. oxygen and sugar into water. d. carbon dioxide and water into sugar. e. sugar and water into lipids.
Biology & Microbiology
In order for hormones like auxin to be used as a chemical signal within a plant it must travel through the xylem to reach the site of activity.
Answer the following statement true (T) or false (F)
Biology & Microbiology
Which animals are ectothermic?
A) frogs and mammals B) lizards and birds C) turtles and lizards D) birds and mammals
Biology & Microbiology
The sequence of the four bases in DNA is referred to as its ___ structure.
What will be an ideal response?
Biology & Microbiology