General Science Flashcards

If one tectonic plate slides under another, the process is known as:

Answer: Subduction

Subduction is a geological process where one tectonic plate moves under another and sinks into the mantle as the plates converge. This process is a fundamental part of plate tectonics and is associated with phenomena like volcanic activity and earthquakes.

Plants are autotrophs, meaning that they:

Answer: Are able to produce their own food

Autotrophs are organisms that can produce their own food, typically using light (photosynthesis) or chemical energy (chemosynthesis). Plants are the primary example of autotrophs, converting sunlight into energy-rich organic compounds.

Plant and animal cells both have cell membranes and nuclear membranes. However, plant cells have a structure that animal cells do not, known as a:

Answer: Cell Wall

While both plant and animal cells share many organelles like cell membranes, nuclei, mitochondria, and ribosomes, plant cells possess a rigid cell wall outside their cell membrane. This cell wall provides structural support and protection, a feature absent in animal cells.

Muscles in the human body require what energy compound to function?

Answer: ATP

Muscles in the human body, like all living cells, require Adenosine Triphosphate (ATP) as their primary energy currency. ATP is produced through cellular respiration and is directly used to power muscle contraction and other cellular processes.

If a bowling ball is pushed with 20 Newtons of force and has a mass of 4 kg, what is its initial acceleration?

Answer: 5 m\/s^2

Newton's Second Law of Motion states that Force (F) equals Mass (m) times Acceleration (a), or F = ma. To find the acceleration, rearrange the formula to a = F/m. Given a force of 20 Newtons and a mass of 4 kg, the acceleration is 20 N / 4 kg = 5 m/s².

When a human cell divides in mitosis, the two daughter cells will each have:

Answer: 46 Chromosomes

Mitosis is a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus. Human somatic cells are diploid and contain 46 chromosomes. Therefore, after mitosis, each daughter cell will also have 46 chromosomes.

In an electromagnetic wave, as the frequency of the wave becomes greater, what becomes shorter?

Answer: The wavelength

In an electromagnetic wave, frequency and wavelength are inversely proportional. This means that as the frequency of the wave increases, its wavelength decreases, and vice versa, while the speed of light remains constant. This relationship is described by the equation c = fλ, where c is the speed of light, f is frequency, and λ is wavelength.

Which of the following time periods is the longest?

Answer: Eon

Geological time is divided into hierarchical units. An Eon is the largest division of geological time, encompassing vast spans of hundreds of millions to billions of years. Eras, Periods, and Ages are progressively smaller subdivisions within an Eon, making the Eon the longest time period among the given options.

Water has a heat capacity of 4.2 J\/g*C. This means that to heat up 100 mL of water 1 degree Celsius, we need:

Answer: 420 Joules

The heat capacity of water is 4.2 J/g°C. Since 100 mL of water has a mass of approximately 100 grams (as the density of water is 1 g/mL), we can calculate the energy needed. To heat 100 grams of water by 1 degree Celsius, you multiply the mass (100 g) by the heat capacity (4.2 J/g°C) and the temperature change (1°C), resulting in 420 Joules.

In the lily flower, the red color is dominant and the white color is recessive. This means that if you cross a homozygous red flower with a white one, the offspring will be:

Answer: All red

In genetics, a dominant allele (red, R) masks the expression of a recessive allele (white, r). A homozygous red flower has two dominant alleles (RR), and a white flower has two recessive alleles (rr). When these are crossed, all offspring will inherit one R allele from the red parent and one r allele from the white parent, resulting in a heterozygous genotype (Rr). Since red is dominant, all Rr offspring will display the red phenotype.

Which of the following is a characteristic of the tundra ecological biome?

Answer: Landscape dominated by shrubs and short trees

The tundra biome is characterized by extremely cold temperatures, low precipitation, and permafrost (permanently frozen ground). These harsh conditions inhibit the growth of tall trees, leading to a landscape dominated by low-growing vegetation such as shrubs, mosses, lichens, and short grasses. This adaptation allows plants to survive the short growing season and cold climate.

A train travels at 25 mph for 3 hours. How far did the train move?

Answer: 75 miles

To find the distance traveled, you use the formula: Distance = Speed × Time. The train travels at a speed of 25 miles per hour (mph) for 3 hours. Multiplying these values (25 mph * 3 hours) gives a total distance of 75 miles.

Muscles in the human body require what energy compound to function?

Answer: ATP

Adenosine Triphosphate (ATP) is the direct and immediate energy source used by cells, including muscle cells, to perform work. While other molecules like fats can be metabolized to produce ATP, ATP itself is the primary energy currency that powers cellular processes like muscle contraction. The energy is released when ATP is hydrolyzed to ADP.

A solution contains 0.1 molar hydrogen ions (H+). This means the solution is likely:

Answer: Around pH 1.0

The pH scale measures the acidity or alkalinity of a solution, defined as the negative logarithm of the hydrogen ion concentration ([H+]). If the hydrogen ion concentration is 0.1 molar, which can be written as 10^-1 M, then the pH is calculated as -log(10^-1). This calculation yields a pH of 1.0, indicating a strongly acidic solution.

The Earth is about 4.5 billion years old. About many years ago did life first appear?\t

Answer: 3.5 billion years

The Earth formed approximately 4.5 billion years ago. Scientific evidence, primarily from ancient microbial fossils and stromatolites, suggests that the earliest forms of life appeared on Earth around 3.5 to 3.8 billion years ago. This makes 3.5 billion years the most accurate estimate among the choices for the first appearance of life.

The sun’s energy reaches the Earth’s surface primarily in the form of:\t

Answer: Visible light radiation

The sun emits a wide spectrum of electromagnetic radiation, but the Earth's atmosphere is most transparent to visible light. Consequently, the largest portion of the sun's energy that successfully penetrates the atmosphere and reaches the Earth's surface is in the form of visible light radiation. This visible light is crucial for processes like photosynthesis.

Which of the following statements about the Earth is true?\t

Answer: The mantle makes up the largest percentage of the Earth’s volume

The Earth's interior is composed of several distinct layers: the crust, mantle, and core. The mantle is the thickest of these layers, extending from beneath the crust to the outer core, and accounts for approximately 84% of the Earth's total volume. The core is largely molten, and the crust is a relatively thin outer layer.

If an unbalanced force acts on an object, then the object will begin to accelerate according to:\t

Answer: Newton's Second Law

Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F=ma). This means that if an unbalanced force acts on an object, it will cause the object to change its velocity, i.e., accelerate. Newton's First Law describes inertia, and Kepler's Laws relate to planetary motion.