a scientist needs 12 ml of a solution they have a bottle with 12l in it do they have enough

HESI A2

Biology HESI A2 Practice Test

1. A scientist needs 12 mL of a solution. They have a bottle with 12L in it. Do they have enough?

A. Yes, they have exactly what they need
B. Yes, they have more than what they need
C. No, they do not have enough
D. None of the above

Correct answer: B

Rationale: 1 liter has 1000 milliliters. To convert from milliliters to liters, the decimal point moves three places to the left. So, the bottle has 12000 mL of solution, which is a lot more than the required 12 mL. Therefore, the scientist has more than what they need. Choice A is incorrect as the bottle has more than the required amount. Choice C is incorrect as the bottle contains significantly more solution than needed. Choice D is incorrect as the scientist does have more than enough solution.

2. How does water affect the temperature of a living thing?

A. Water increases temperature.
B. Water keeps temperature stable.
C. Water decreases temperature.
D. Water does not affect temperature.

Correct answer: B

Rationale: Water has a high specific heat capacity, which means it can absorb and release large amounts of heat with minimal temperature change. This property helps water regulate the temperature of living things by maintaining a stable environment. Choice A is incorrect because water does not consistently increase temperature, but rather helps in temperature regulation. Choice C is incorrect as water doesn't typically decrease temperature in living organisms. Choice D is incorrect since water does play a crucial role in regulating temperature.

3. What takes place in a lysosome?

A. Ribosomes are made.
B. Food is produced.
C. Water is stored.
D. Food is digested.

Correct answer: D

Rationale: In a lysosome, food particles are digested through the action of enzymes. Lysosomes are membrane-bound organelles containing digestive enzymes that break down large molecules into smaller ones, allowing the cell to utilize the nutrients for energy and other processes. Choices A, B, and C are incorrect because ribosomes are not made in lysosomes, food is not produced in lysosomes, and lysosomes do not store water.

4. What is the effect of the Earth's rotation on the atmosphere and on all objects on the Earth's surface?

A. The Coriolis effect
B. The Corona effect
C. The Archimedes effect
D. The tidal effect

Correct answer: A

Rationale: The Coriolis effect is the effect of the Earth's rotation on the atmosphere and on all objects on the Earth's surface. It causes moving objects and currents to be deflected to the right in the northern hemisphere and to the left in the southern hemisphere. This deflection is a result of the rotation of the Earth and plays a crucial role in influencing weather patterns and ocean currents around the globe. The other choices provided are incorrect. The Corona effect is related to the Sun's atmosphere, the Archimedes effect involves buoyancy in fluids, and the tidal effect is associated with the gravitational forces between the Earth, the Moon, and the Sun.

5. Which component is not found in the nucleotide of DNA?

A. Simple sugar
B. Nitrogen base
C. Phosphate group
D. Citric acid

Correct answer: D

Rationale: Citric acid is not found in the nucleotide of DNA. A DNA nucleotide is composed of a simple sugar (deoxyribose), a nitrogen base (adenine, thymine, cytosine, or guanine), and a phosphate group. Citric acid is not part of DNA nucleotides; instead, it is involved in the citric acid cycle of cellular respiration. Choices A, B, and C are essential components of DNA nucleotides, making them incorrect answers.