Those wishing to reduce the bad cholesterol levels in their blood should avoid saturated fats. Sources of saturated fats include meats, shellfish, eggs, milk, and milk products.
Water at sea level freezes at 32°F. This can also be expressed as 0°C and 273 K.
Of the subatomic particles listed, the proton has the largest mass. Among subatomic particles, protons and neutrons have the most mass. Electrons, positrons, and neutrinos all have negligible masses relative to protons and neutrons.
An “autotroph” is an organism capable of synthesizing its own organic substances from inorganic compounds, as through photosynthesis. Another term for an autotroph is a producer. An apple tree is an example of an autotroph. A vulture is a type of consumer known as a scavenger, which means it feeds on dead or decaying flesh. A toadstool is a type of fungi. It feeds on and breaks down dead organic matter. A sea anemone is a consumer that feeds on small marine organisms and organic matter.
The Earth is approximately 4.6 billion years old, and that for most of that time, very few fossil traces were left. This is why the period from 4.6 billion years to 570 million years ago is called the Precambrian eon, meaning the period before the fossil record began.
Mercury, Venus, and Mars are all smaller than Earth. Of the planets listed, only Uranus is larger than Earth.
Falling stars are meteoroids that fall into the Earth’s gravitational field. They leave streaks of light, called meteors, as they are burned up in Earth’s atmosphere.
The study of interactions between organisms and their interrelationships with the physical environment is known as ecology. Cytology is the study of cells, physiology is the study of processes in the organism, and embryology is the study of embryos and their development.
The small intestine absorbs most of the nutrients in food.
Tides are caused by the gravitational pull that exists between the Moon and Earth. High tides occur twice a day, when the Moon is at the points closest to and farthest from the coastline experiencing a high tide.
According to Newton’s Law of Gravitation, if the mass of the Earth were doubled, the gravitational force on the Earth would double, not quadruple.
Of the states of electromagnetic radiation listed, radio waves have the longest wavelength and lowest frequency.
The speed of light can slow down, depending on the material through which the waves move. For example, light travels more slowly through water or glass than through air. The ratio by which light is slowed down is called the refractive index of that medium.
A high pH indicates a substance that is basic rather than acidic. Of the food products listed, baking soda is the most basic and has the highest pH.
Carbohydrates include starches (potatoes and pasta) and sugars (fruits). Almonds are a type of nut and have a high fat content.
The levels of classification, from largest to smallest, are: domain, kingdom, phylum, class, order, family, genus, species. Members of a family, genus and species are all more similar than members of an order. Of the answer choices given, members of an order are only more alike than members of a class.
The number of protons in the nucleus of an atom gives it its atomic number. The number of electrons can also be used to determine atomic number, but only if the atom is neutral (in a neutral atom, proton number = electron number). The atomic symbol is the letter designation of the element and is based on the element’s Latin name. Atomic weight is the mass of one atom expressed in atomic mass units. Atomic radius gives the size of the atom.
The diaphragm is a system of muscles that allow the lungs to expand and contract, drawing air in and out.
The atom of an element with an atomic number of 17 must have 17 protons. The number of electrons (A), however, is only the same as the number of protons if the atom is neutral. The number of neutrons (C) is often similar to but not necessarily equal to the number of protons. For example, hydrogen often has one proton and no neutrons. And since the atomic mass (D) is contributed to by both protons and neutrons, it is almost always larger than the atomic number.
Because mushrooms absorb nutrients from decaying leaves, they are classified as saprophytes. Another term for a plant living on dead or decaying organic matter is decomposer.
The vessel with the least oxygenated blood is the pulmonary artery, which sends oxygen-depleted blood from the heart into the lungs to be oxygenated.
Saliva in the mouth begins the process of breaking down starch. Fats, proteins and vitamins begin breaking down later in the digestive process.
The Moneran kingdom is composed of prokaryotic organisms; that is, organisms with cells that lack nuclei.
An atom that is not electrically neutral is called an ion. It possesses a positive or negative charge. An isotope is two or more atoms of the same element that have the same atomic number but different mass number; i.e., they have the same number of protons but a different number of neutrons. A positron is a positively charged particle having the same mass and magnitude of charge as the electron. An allotrope is an element with two or more different forms; e.g., carbon is an allotrope and can exist as either graphite or diamond.
A metamorphic rock is one that has undergone significant changes due to pressure, heat, and/or water. This results in a more compact and more highly crystalline state. Marble is an example of a metamorphic rock.