Very powerful microscopes were needed before cells could be observed in detail
Answer: The lock-and-key mechanism is usually associated with the complementary shapes of an enzyme with a single substrate wherein the lock that is being referred to is the enzyme and the substrate is the key. One right sized substrate (key) fits into the active site (key hole) of the enzyme (lock).
Answer:
A virus attaches to a specific receptor site on the host cell membrane through attachment proteins in the capsid or via glycoproteins embedded in the viral envelope. The specificity of this interaction determines the host (and the cells within the host) that can be infected by a particular virus.
Explanation:
A
The relationship between population growth and resources is inverse; as one goes up the other goes down.
Explanation:
An inverse relationship is one where when one variable is affected positively, the other is negatively impacted, and vice versa. In other terms, when one variable increases the other decreases.
When population growth increases, the strain on the resources increases, due to increased competition, and hence the resources decrease. This is why ideally apopulation cannot grow indefinitely because resources are always limited. The population growth will start to levels off as it reaches carrying capacity. When the resources become depleted the population growth plummets.
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For more on carrying capacity of a habitat check out;
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Answer:
D. Water is the most abundant atom in Earth’s atmosphere.
Explanation:
An atom can be defined as the smallest particle of an element (e.g., oxygen, hydrogen, etc). Water is a molecule (H2O) because its atoms are connected by molecular bonds (i.e., water is not an atom). Water is the most abundant molecule on the Earth's surface which covers more than 70 percent of the world's surface. A water molecule contains one oxygen (O) and two hydrogen (H2) atoms which are connected by covalent bonds. Water is also a compound known as a diatomic molecule, i.e., a molecule composed of two atoms of the same type.
