Which of the following act as the brakes of the cell cycle and prevent cells from dividing too quickly?

a. oncogenes
b. proto-oncogenes
c. cyclins
d. tumor suppressor genes


d. tumor suppressor genes

Biology & Microbiology

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Answer the following statements true (T) or false (F)

1. Fermentation is a more efficient form of energy production than aerobic respiration. 2. Substrate phosphorylation occurs when protons pass through ATP synthase and combine with oxygen to make water. 3. In cellular respiration, an H+ electrochemical gradient is formed so that the H+ concentration is lower in the intermembrane space than inside the matrix. 4. If oxygen is present, pyruvate will be converted to acetyl CoA in the mitochondrial matrix.

Biology & Microbiology

The Shannon diversity index for the low marsh is __.The Shannon diversity index for the high marsh is __.

image

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Class Reptilia includes all reptiles, and Class Aves includes all birds. However, a cladistics approach would place birds in the same class with reptiles. Why would a cladistician classify birds and reptiles in a single class despite the behavioral and physical differences between the two?

What will be an ideal response?

Biology & Microbiology

A hummingbird is "drinking" nectar containing sugar from a red columbine flower. Arrange the following events to occur in the hummingbird in order from the first to last: (1 ) Glucose sugar is converted to pyruvate. (2 ) Energy from high-energy electrons is released from an electron transport chain. This energy is used to make ATP. (3 ) The hummingbird exhales carbon dioxide and energy is stored

in electron carriers. (4 ) The hummingbird has the ability to beat its wings 40 - 80 times a second. a. 1, 4, 3, 2 b. 2, 1, 3, 4 c. 1, 2, 3, 4 d. 2, 3, 4, 1 e. 1, 3, 2, 4

Biology & Microbiology