Biology Assistance needed- Biology Experts only

 Question 1

Select one answer.

10 points

How does the body react to rapid weight loss?

• Hunger decreases and the metabolic rate goes up.

• Hunger increases and the metabolic rate goes up.

• Hunger increases and the metabolic rate goes down.

  Question 2

  Select one answer.

  10 points

  Which of the graphs in the figure best illustrates the activity of an enzyme as substrate concentration increases from 0 to the saturation point of the enzyme?

• Question 3

  Select one answer.

  10 points

  What is the connection between a person’s genes and his or her metabolism?

• DNA regulates metabolic pathways directly

• enzymes encoded by genes regulate metabolic pathways

• structural proteins encoded by genes regulate metabolic pathways

  Question 4

  Select one answer.

  10 points

  Energy is stored in different forms in the body. ATP is very unstable and is put to use very quickly in cells. Other storage molecules last longer. Which gives the major energy stores of the body in the correct order?

• Short term: fat. Medium term: glycogen. Long term: glucose.

• Short term: glycogen. Medium term: glucose. Long term: fat.

• Short term: glucose. Medium term: glycogen. Long term: fat.

  Question 5

  Select all that apply.

  10 points

  Which of the following are characteristics of metabolic pathways?

• Contain many intermediates.

• Are regulated.

• Each pathway has a key enzyme that catalyzes most of the reactions

• Are specific for each organism

• Are often reversible

  Question 6

  Select one answer.

  10 points

  What would be a typical regulatory system in a metabolic pathway?

• The pathway’s product slows it down, so that the product is maintained at a constant level in the cell or organism.

• The pathway’s product makes it go faster, so that more and more of the product builds up in the cell or body.

  Question 7

  Select one answer.

  10 points

  In a metabolic pathway, a typical control mechanism is to have: ________

• a lack of reactant stimulate the pathway.

• the final product inhibit the enzyme responsible for its own production.

• a reactantinhibit a late step.

• the final product inhibit an early step.

  Question 8

  Select one answer.

  10 points

  Which best describes body weight regulation in a normal human who is living in a modern society?

• Our normal responses of appetite and metabolism tend to cause weight gain in modern societies, and they also tend to make weight loss difficult.

• Our normal responses of appetite and metabolism ensure that adults remain at a given normal body weight. Any change from this normal weight sets in motion responses that return the body to its normal weight.

  Question 9

  Select one answer.

  10 points

  Which of the following regulatory mechanisms is described incorrectly?

• All are correct

• competitive inhibitor: binds to the active site of the enzyme

• substrate availability: more substrate increases enzyme activity (until it reaches saturation)

• enzyme modification: enzyme gains or loses a functional group

• feedback inhibition: product inhibits its own production

  Question 10

  Select one answer.

  10 points

  The fundamental difference between competitive and non-competitive inhibition is: _________________________

• the size of the active site of the enzyme.

• the manner of binding of the inhibitor to the enzyme.

• the manner of binding of the substrate to the enzyme.

  Question 11

  Select one answer.

  10 points

  Imagine a hypothetical organism (critter). A DIPLOID cell from this organism has 20 chromosomes. How many chromosomes would be found in a HAPLOID GAMETE of this organism?

• 20

• 10

• 40>

• 46

  Question 12

  Select one answer.

  10 points

  Imagine a hypothetical organism (critter). A DIPLOID cell from this organism has 20 chromosomes. How many chromosomes would be found in a GERM CELL of this organism?

• 40

• 10

• 46

• 20

  Question 13

  Select one answer.

  10 points

  Gametes are:

• haploid

• sometimes haploid and sometimes diploid

• diploid

  Question 14

  Select one answer.

  10 points

  During what stage of the cell cycle does the cell grow and carry out it regular functions?

• G1

• G2

• Mitosis

• S

  Question 15

  Select one answer.

  10 points

  If a germ cell has 20 chromosomes, how many chromosomes will you find in the daughter cells, after meiosis?

• 20

• 40

• 10

• 30

  Question 16

  Select one answer.

  10 points

  A muscle cell is an example of what type of cell?

• a zygote cell

• a somatic cell

• a gamete cell

• a germ cell

  Question 17

  Select one answer.

  10 points

  If a germ cell has 46 chromosomes, how many chromosomes will you find in the daughter cells, after meiosis?

• 92

• 46

• 69

• 23

  Question 18

  Select one answer.

  10 points

  During the S phase of the cell cycle, DNA is replicated. What form would you expect the DNA to be in?

• It would be in a loose pile.

• It would be tightly wound around histone proteins as chromosomes.

• It would be made of separate nucleotides just floating in the nucleus.

  Question 19

  Select one answer.

  10 points

  During which stage of the cell cycle is the DNA replicated?

• S

• Cytokinesis

• Mitosis

• G2

  Question 20

  Select one answer.

  10 points

  If a cell is not dividing, and has not yet begun replicating its DNA what phase of the cell cycle would it be in?

• S

• M

• G2

• G1

  Question 21

  Select one answer.

  10 points

  An organism grows through what process?

• Cellular respiration

• Protein synthesis

• Mitosis

• Meiosis

  Question 22

  Select one answer.

  10 points

  Cancer can be the result of all of the following EXCEPT?

• A non-functional tumor suppressor gene and a non-functional proto-oncogene.

• Exposure to a carcinogen.

• A disregulation of the cell cycle.

• A functional tumor suppressor gene and a functional proto-oncogene.

  Question 23

  Select one answer.

  10 points

  What stage of division is this cell in?

• Anaphase

• Prophase

• Telophase

• Metaphase

  Question 24

  Select one answer.

  10 points

  What stage of division is this cell in?

• Metaphase

• Telophase

• Prophase

• Anaphase

  Question 25

  Select one answer.

  10 points

  The centrosome disappears and the nuclear envelopes form in what stage of mitosis?

• metaphase

• telophase

• interphase

• anaphase

• prophase

  Question 26

  Select one answer.

  10 points

  What stage of cell division is illustrated below?

• Metaphase

• Prophase

• Telophase

• Anaphase

  Question 27

  Select one answer.

  10 points

  Which of the following tasks is accomplished through the process of mitosis?

• Replacement of dysfunctional cells

• Production of sperm or eggs

• Cell growth

  Question 28

  Select one answer.

  10 points

  In what stage are sister chromatids separated and pulled to opposite sides of the cell.

• telophase

• interphase

• anaphase

• metaphase

• prophase