Answer the following question given this paragraph: Cyclins regulate the cell cycle only when they are tightly bound to Cdks. To be fully active, the Cdk/cyclin complex must also be phosphorylated in specific locations. Like all kinases, Cdks are enzymes (kinases) that phosphorylate other proteins. Phosphorylation activates the protein by changing its shape. The proteins phosphorylated by Cdks are involved in advancing the cell to the next phase. (Figure 10.12). The levels of Cdk proteins are relatively stable throughout the cell cycle; however, the concentrations of cyclin fluctuate and determine when Cdk/cyclin complexes form. The different cyclins and Cdks bind at specific points in the cell cycle and thus regulate different checkpoints. Q: What regulates the cell cycle only when they are tightly bound to cdks? Choices: - kinases - subclades - hormones - cyclins A:
cyclins
(Question)
Answer the following question given this paragraph: Blood from the lungs enters the left atrium of the heart. The left atrium pumps the blood to the left ventricle, which pumps it to the body. Q: Blood from what organs enters the left atrium of the heart? Choices: - Lymph nodes - intestines - Brain - lungs A:
(Answer)
lungs
Ques: Answer the following question given this paragraph: The amount of reactants and products do not have to be equal. However, after equilibrium is attained, the amounts of reactants and products will be constant. Q: In a chemical reaction, the amounts of reactants and products will be constant when what state is attained? Choices: - saturation - peak - homogeneity - equilibrium A:
Ans: equilibrium
(Q).
Answer the following question given this paragraph: Most of the world's largest mountains form as plates collide at convergent plate boundaries. Continents are too buoyant to get pushed down into the mantle. So when the plates smash together, the crust crumples upwards. This creates mountains. Folding and faulting in these collision zones makes the crust thicker. Q: Why are continents unable to be pushed down into the mantle by plate boundaries? Choices: - gravity - surface tension - density - buoyancy A:
(A).
buoyancy
Ques:Answer the following question given this paragraph: The age-sex structure of a population is the number of individuals of each sex and age in the population. Age-sex structure influences population growth. It is represented by a population pyramid. The number of survivors at each age is plotted on a survivorship curve. Q: What helps represent age-sex structure of the population? Choices: - habitat chart - density graph - biome model - population pyramid A:

Ans:population pyramid
Answer the following question given this paragraph: There is a lot of volcanic activity at divergent plate boundaries in the oceans. As the plates pull away from each other, they create deep fissures. Molten lava erupts through these cracks. The East Pacific Rise is a divergent plate boundary in the Pacific Ocean ( Figure below ). The Mid-Atlantic Ridge is a divergent plate boundary in the Atlantic Ocean. Q: In what ocean is the mid-atlantic ridge located? Choices: - indian ocean - pacific ocean - arctic ocean - atlantic ocean A:
atlantic ocean