Since all organisms carry on cellular respiration, all living cells must contain mitochondria.
Answer the following statement true (T) or false (F)
False
Prokaryotic cells carry out cellular respiration but they do not contain mitochondria. The elements of the respiratory pathway are present in the plasma membrane.
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Antipodals and synergids are
A. produced in the female gametophyte. B. the result of double fertilization. C. what will fuse to form the endosperm. D. responsible for pollen tube formation. E. nonfunctional vestigal structures.
A replication fork:a
is only seen in prokaryotic chromosomes. b. is only seen in bacterial cells. c. is a Y-shaped structure where both DNA strands are replicated simultaneously. d. is a site where one DNA strand serves as a template, but the other strand is not replicated. e. is created by the action of the enzyme RNA polymerase.
Which of the following immune system cells is most severely depleted by HIV/AIDS ?
(A) Plasma B cells (B) Memory B cells (C) Helper T cells (D) Cytotoxic ("Killer") T cells
The connection between nutritional deficiency and poverty was made during the same period as the discovery of the role of vitamins in health
a. true b. false