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25 Dec 2018

If a particular cell was doing 5,000 different chemical reactions per hour, how many enzymes would you expect that cell to produce? How many for a 24 hour period?

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Collen Von
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25 Dec 2018

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You count a total of eight chromosomes in an animal cell at metaphase I in meiosis. (1pt)a) What is this organism’s diploid number?b) How many pairs of homologous chromosomes are there?c) How many sister chromatids?d) Would you expect to see the same or different numbers of sister chromatids in a mitotic metaphase cell from the same organism?

1. Compared to its energy content at rest, a vertebrate muscle that has just undergone heavy exercise would have:

a. more ATP and more ADP

b. less ATP and more ADP

c. more ATP and less ADP

d. less ATP and less ADP

2. When compared to a lung cell, a muscle cell would possess:

a. more mitochondria

b. more rough endoplasmic reticulum

c. less mitochondria

d. less rough endoplasmic reticulum

3.Enzymes are protein catalysts in organisms' bodies that permit them to carry out chemical reactions at relatively low temperatures. An enzyme is specific because only few kinds of substrate molecules fit in its activity site. Which of the following statements about enzymes is FALSE?

a. enzymes catalyze only a particular reaction of specific substrates

b. enzymes usually work only in a particular pH range

c. enzymes increase the energy of the reactant molecules

d. enzymes bind their substrates and hold them in a particular orientation

4. This process is essential if the two cells produced as a result of mitosis are to have a full complement of genes.

a. Replication c. Nondisjunction

b. Cytokinesis d. Synapsis

Proteins perform many roles in cells. Which of the following in a role you would NOT expect for proteins?

a. Proteins can carry out enzymatic reactions.

b. Proteins can bind to DNA to regulate translation.

c. Proteins can transport chemical species across the cell membrane.

d. Proteins can transport molecules like oxygen through the blood stream.

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