To control the cell cycle:a
the activity of Cdks stays the same throughout the cell cycle.
b. cyclins fluctuate during the cell cycle.
c. Cdks are active only when they are released from cyclins.
d. the anaphase-promoting complex stimulates DNA replication.
e. M-Cdk inhibits mitosis.
b
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Which of the following statements correctly describe(s) a relationship between transpiration and other processes in plants? Select all that apply.
a. Transpiration is important in cooling leaves on warm, sunny days. b. In most plants, the highest rate of transpiration occurs when the rate of photosynthesis is also highest. c. Open stomata provide a low-resistance pathway for CO2 to enter and for water to exit the leaf. d. The large surface area exposed to air inside the leaf maximizes the plant’s ability to absorb CO2 while minimizing water loss through transpiration. e. Water is pulled from the roots to the leaves by transpiration, whereas mineral nutrients diffuse from the roots to the leaves. f. To minimize water loss during dry conditions, most plants must also restrict their ability to carry out photosynthesis.
Gene duplication can result from _____
a. a normal crossover event b. exon shuffling c. unequal crossing over d. a point mutation e. alternative splicing
Which ion is required to be present in a significant quantity in order to allow myosin heads to form cross bridges with actin filaments?
a. Calcium b. Hydrogen c. Potassium d. Sodium e. Glucose
Biomining takes advantage of prokaryotes ability to ________ metals.
A. reduce B. reduce the solubility of C. oxidize D. directly solubilize E. bioaccumulate