Questions & Answers
Browse all 18 questions from the
Advanced Life Science Concepts study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
Which of the following cellular organelles is primarily responsible for the synthesis of phospholipids and steroid hormones?
-
A
Golgi apparatus
-
B
Lysosome
-
C
Smooth endoplasmic reticulum
-
D
Mitochondrion
2
The concept of endosymbiosis, a key hypothesis in explaining the origin of eukaryotic organelles, is most directly supported by the presence of what in mitochondria and chloroplasts?
-
A
Ribosomes and a double membrane
-
B
Linear DNA and histones
-
C
Circular DNA and their own protein-synthesizing machinery
-
D
A single membrane and a peptidoglycan cell wall
3
In the process of DNA replication, which enzyme is primarily responsible for unwinding the DNA double helix by breaking hydrogen bonds between base pairs?
-
A
DNA polymerase
-
B
RNA primase
-
C
Helicase
-
D
DNA ligase
4
The Calvin cycle, a crucial part of photosynthesis, occurs in which part of the chloroplast?
-
A
Thylakoid membrane
-
B
Stroma
-
C
Outer membrane
-
D
Intermembrane space
5
Which mechanism is primarily responsible for the movement of water molecules across a semipermeable membrane from an area of high water concentration to an area of low water concentration?
-
A
Active transport
-
B
Facilitated diffusion
-
C
Osmosis
-
D
Pinocytosis
6
The development of antibiotic resistance in bacterial populations is a classic example of which evolutionary principle?
-
A
Genetic drift
-
B
Gene flow
-
C
Natural selection
-
D
Artificial selection
7
Which phase of meiosis is characterized by the synapsis of homologous chromosomes and the formation of chiasmata, where genetic recombination occurs?
-
A
Prophase I
-
B
Metaphase II
-
C
Anaphase I
-
D
Telophase II
8
The genetic code is often described as degenerate. What does this degeneracy specifically refer to?
-
A
Each codon codes for more than one amino acid.
-
B
Multiple codons can code for the same amino acid.
-
C
The code is identical in all known organisms.
-
D
The genetic code changes over time.
9
Which of the following biomolecules is primarily responsible for catalyzing biochemical reactions within living organisms?
-
A
Nucleic acids
-
B
Lipids
-
C
Carbohydrates
-
D
Proteins (enzymes)
10
The Hardy-Weinberg principle describes a theoretical population that is not evolving. Which of the following conditions must be met for a population to be in Hardy-Weinberg equilibrium?
-
A
Random mating only
-
B
No mutation, gene flow, genetic drift, or natural selection
-
C
High rates of mutation
-
D
Constant gene flow
11
Which of the following neurotransmitters is primarily associated with muscle contraction and learning in the peripheral nervous system?
-
A
Serotonin
-
B
Dopamine
-
C
Acetylcholine
-
D
GABA
12
The process by which a single cell differentiates into a specialized cell type is known as:
-
A
Fertilization
-
B
Mitosis
-
C
Cellular differentiation
-
D
Apoptosis
13
Which layer of the skin is avascular and primarily composed of keratinized stratified squamous epithelium?
-
A
Dermis
-
B
Hypodermis
-
C
Epidermis
-
D
Stratum corneum
14
The absorption of light energy by pigments such as chlorophyll is the initial step in which biological process?
-
A
Cellular respiration
-
B
Fermentation
-
C
Photosynthesis
-
D
Glycolysis
15
What is the primary function of the myelin sheath surrounding axons in the nervous system?
-
A
To transmit signals between neurons
-
B
To protect the axon from damage
-
C
To increase the speed of nerve impulse transmission
-
D
To provide nutrients to the neuron
16
In ecological terms, a population's carrying capacity refers to:
-
A
The number of individuals that can migrate into an area.
-
B
The maximum population size that a given environment can sustain indefinitely.
-
C
The rate at which individuals are born.
-
D
The total number of species in an ecosystem.
17
Which of the following is a key characteristic of a prokaryotic cell that distinguishes it from a eukaryotic cell?
-
A
Presence of a nucleus
-
B
Presence of membrane-bound organelles
-
C
Absence of a cell wall
-
D
Circular DNA in the cytoplasm
18
The central dogma of molecular biology describes the flow of genetic information. Which process involves the synthesis of RNA from a DNA template?
-
A
Translation
-
B
Replication
-
C
Transcription
-
D
Reverse transcription
