問題一覧
1
Atoms with a full outer electron shell are typically:
B) Stable
2
In a negative feedback loop, the response:
Counteracts the initial stimulus.
3
Which process does NOT require energy?
C) Facilitated diffusion
4
Which of the following correctly describes DNA structure?
B) Double-stranded with thymine
5
Which of the following is NOT one of the four classes of biomolecules?
C) Vitamins
6
In a Bohr diagram of an atom, what is represented in the nucleus?
B) Protons and neutrons
7
What is checked at the G1 checkpoint?
B) Cell size and DNA integrity
8
Entropy is a measure of:
B) Disorder in a system.
9
Transcription occurs in which part of the cell?
B) Nucleus
10
In the context of protein-binding reactions, specificity refers to:
C) The ability to bind to a specific ligand.
11
Okazaki fragments are associated with which strand during DNA replication?
B) Lagging strand
12
Which type of bond involves the transfer of electrons?
B) Ionic bond
13
Enzymes function to:
B) Lower the activation energy of reactions.
14
The building blocks of proteins are:
B) Amino acids
15
What is the primary fluid compartment within cells?
C) Intracellular Fluid
16
Which enzyme unwinds the DNA during replication?
D) Helicase
17
A nucleotide is composed of:
C) A sugar, a phosphate group, and a nitrogenous base
18
In a hypertonic solution, cells will:
B) Shrink
19
During which phase of the cell cycle does DNA replication occur?
B) S phase
20
The first law of thermodynamics states that:
B) Energy cannot be created or destroyed.
21
The start codon for translation is:
B) AUG
22
An endergonic reaction:
B) Requires energy input.
23
The octet rule states that atoms are most stable when they have:
C) Eight electrons in the outer shell.
24
Which mechanism primarily regulates the movement of materials across compartments?
D) All of the above
25
Activation energy is:
B) The energy needed to start a reaction.
26
Homeostasis refers to:
B) The maintenance of a stable internal environment.
27
Which site in the ribosome holds the tRNA carrying the growing polypeptide chain?
B) P-site
28
Which of the following particles has a positive charge?
B) Proton
29
Which of the following statements about selective permeability is TRUE?
B) It maintains homeostasis by regulating entry and exit of substances.
30
Cations:
B) Positively charged ions.
31
An isotonic solution has:
C) Equal solute concentration to the cell.