Chromatids
What will be an ideal response?
Either of the two strands formed when a chromosome duplicates, sister chromatids are connected by a Centromere
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During the initiation of nitrogen-fixation nodules, how do the Rhizobium bacteria enter into the cortex of the root?
A. through the plasmadesmata of the root hairs B. via the apoplastic pathway C. using proton pumps D. through a membrane tube called an infection thread E. by repeated cell divisions
Rain shadows form on the leeward sides of mountain ranges
Indicate whether the statement is true or false.
In many organelles, groups of different enzymes are located on membranes in close proximity to each other because
a. attaching enzymes to the membrane prevents the cell from losing them to the surrounding environment. b. when enzymes are in close proximity, each one can catalyze more than one type of reaction. c. these enzymes are involved in the same metabolic pathway and keeping them closer together increases the efficiency of the pathway. d. all enzymes must act in groups to position substrates in the proper orientation to produce the product.
Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be to _____
A) determine if they have thylakoids in the chloroplasts B) test for liberation of O2 in the light C) test for CO2 fixation in the dark D) do experiments to generate an action spectrum