Question 20 (1 point) A hypothesis is _______. Question 20 options: a)an educate

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Question 20 (1 point)

A hypothesis is _______.

Question 20 options:

a)an educated guess based on a previous observation

b)offered to explain the observed phenomenon or problem

c)a statement that can be tested

d)All of the above

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Question 21 (1 point)

Mitochondria are ____

Question 21 options:

the sites of cellular respiration

the cellular organelle where ATP is produced

found in both plant and animal cells

all of the above

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Question 22 (1 point)

Which of the following is an accurate statement regarding osmosis?

Question 22 options:

Fluid flows from lower solute concentration to high solute concentration

Small molecules flow from a high solute concentration to a low solute concentration

Red blood cells will swell and potentially lyse when placed in a hypertonic solution

All of the above

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Question 23 (1 point)

When intravenous fluids are given to a patient in a hospital, careful attention must be paid to the salt concentration of those fluids. The salt concentration must be isotonic (same salt concentration as exists inside the persons cells). What would happen to the cells lining the blood vesicles, if a doctor administered a hypotonic solution to a patient intravenously?

Question 23 options:

a)The cells lining the blood vesicles would shrink as salts and small molecules would diffuse into the blood vesicles

b)The cells lining the blood vesicles would swell and potentially burst due to osmotic pressure

c)The endothelial cells lining the blood vesicles would pump chloride ions into the cells to move toward equilibrium

d)The endothelial cells lining the blood vesicles would pump sodium ions into the cells to move toward equilibrium

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Question 24 (1 point)

Saturated fats _________

Question 24 options:

contain one or more double bonds

are soluble in water

are an example of complex carbohydrates

are solid at room temperature

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Question 25 (1 point)

Phospholipids are _________

Question 25 options:

Non-polar

Have a hydrophobic head group

A major component of cell membranes

All of the above

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Question 26 (1 point)

Which statement about evolution is FALSE?

Question 26 options:

According to evolutionary theory, you are related to a bacterium, to a yeast cell, to a snake, and to a whale. In fact, you are related to every species now alive on Earth, and to fossil species like dinosaurs as well.

Natural selection acts on genetic differences within a population to cause evolution. Individuals do not evolve.

Natural selection is about slow but steady progress. Through it, populations constantly get better-adapted. When this process is completed for all populations, evolution will come to a stop.

Evolution occurs constantly, without end; there is no endpoint in evolution.

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Question 27 (1 point)

You have a solution that has a pH of 8 and need it to be pH 5. What do you do?

Question 27 options:

Add water

Add a base

Add an acid

Add a buffer

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Question 28 (1 point)

What characteristic of carbon makes it a good backbone for creating diverse and durable molecules?

Question 28 options:

Carbon is a large atom.

Carbon forms four covalent bonds.

Carbon forms hydrogen bonds.

All of the above

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Question 29 (1 point)

Which of the following structures can be found together in eukaryotic cells?

Question 29 options:

ribosomes and lysozomes

cytoplasm and plasma membrane

DNA and ribosomes

ribosomes and endoplasmic reticulum

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a)an educated guess based on a previous observation

b)offered to explain the observed phenomenon or problem

c)a statement that can be tested

d)All of the above

Explanation / Answer

Answer:

20. d

21. d

22. a

23. d

24. d

25. c

26. a

27. c

28. b

29. d

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