Which of the following best describes the nature of the sieve element cells of mature, functioning phloem?

A) living, thick-walled tubes
B) dead, thick-walled tubes
C) dead cells that retain some organelles and some maintenance functions
D) living cells that have lost their nucleus


Answer: D

Biology & Microbiology

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Which statement is true?

a. Blood flows from areas of high hydrostatic pressure in the arterioles to low hydrostatic pressure in the arteries. b. Blood flows from areas of low hydrostatic pressure in the arterioles to high hydrostatic pressure in the arteries. c. Blood flows from areas of high hydrostatic pressure in the arteries to low hydrostatic pressure in the arterioles. d. Blood flows from areas of low hydrostatic pressure in the arteries to high hydrostatic pressure in the arterioles.

Biology & Microbiology

Homeotic gene products _____

a. flank a bacterial operon b. map out the overall body plan in embryos c. control the formation of specific body parts

Biology & Microbiology

In the process of obtaining food, Fungi ________. 

A. secrete enzymes into their surroundings B. take whole pieces of organic matter into their cells C. rely on bacteria to digest their food D. None of the above is correct.

Biology & Microbiology

What is not known to hel control acid reflux?

What will be an ideal response?

Biology & Microbiology