Do passive ways of crossing a plasma membrane require an expenditure of chemical energy (ATP)?
What will be an ideal response?
no
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What term describes an organism with two complete sets of chromosomes from two different species?
A. Tetraploid B. Aneuploid C. Allodiploid D. Allotetraploid
Sponges are believed to have arisen from the choanoflagellates because they possess:a
amebocytes. b. collar cells. c. spongin. d. spicules. e. oscula.
Which of the following is the best measure of an organism's fitness?
a) its size, compared with other members of the same species b) the number of fertile offspring it produces c) how long it lives d) the number of mutations it acquires during its lifetime e) the amount of care it receives from its parents
Kinases are enzymes that can phosphorylate (transfer phosphate groups onto) macromolecules such as proteins. A particular kinase, Kinase 1 is known to promote cell division. It promotes cell division by phosphorylating Protein X. Phosphorylation of Protein X activates Protein X. Once activated, Protein X stimulates the production of other proteins such as Protein Y and Z that directly promote
cell division. In order to function, Kinase 1 requires the presence of Metal A. However, in the presence of Protein A, Kinase 1 is nonfunctional. From the description, what is considered a cofactor of Kinase 1? A. Protein X B. Protein Y C. Protein Z D. Metal A E. Protein A