What part of the DNA replication process would be most directly affected if a strain of bacteria lacking DNA ligase were used to make the cell extracts?
(a) initiation of DNA synthesis
(b) Okazaki fragment synthesis
(c) leading-strand elongation
(d) lagging-strand completion
(d)
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In the presence of both glucose and lactose, the lactose repressor is not bound to the operator and the genes of the lactose operon are expressed.
Answer the following statement true (T) or false (F)
Which of the following is a natural process of plants that can be used by humans to remove toxins from soils? Check all that apply.
_____ secretion of a substance from the roots that breaks down the toxic chemical _____ "storage" of a toxic chemical in plant tissues, which are then removed from the site _____ root pressure pushing toxins from deep in the soil towards the surface _____ physiological breakdown of the chemical into harmless products _____ transport of toxins absorbed by the roots into the shoots, where they can be collected more easily
The process of phosphorylation
A. All of the answer choices are correct. B. may change the shape of the target molecule. C. adds a phosphate group to a molecule. D. removes a phosphate group from a molecule. E. may energize the target molecule.
Which of the following actions occurs in many plants when CO2 concentrations are high?
A. CAM photosynthesis fixes CO2 at night. B. Water evaporates at a higher rate than usual. C. Guard cells lose turgor, and the stomata close. D. Calcium ions are transported faster through the phloem. E. Oxygen is used by plants for photosynthesis.