TEAS Science: Biology and Life Science

Question 1

The Hardy-Weinberg principle states that allele frequencies in a population will remain constant if:

Accepted Answer

There is no mutation, migration, selection, genetic drift, or non-random mating

Answer

Natural selection is strong

Answer

The population is small

Answer

Gene flow between populations is high

Question 2

Which molecule carries amino acids to the ribosome during translation?

Accepted Answer

tRNA

Answer

mRNA

Answer

rRNA

Answer

snRNA

Question 3

Which term describes the movement of water across a semipermeable membrane from high to low water concentration?

Accepted Answer

Osmosis

Answer

Active transport

Answer

Diffusion

Answer

Endocytosis

Question 4

What is the product of glycolysis?

Accepted Answer

Two pyruvate molecules (plus net 2 ATP and 2 NADH)

Answer

Acetyl-CoA and CO2

Answer

ATP only

Answer

Glucose-6-phosphate only

Question 5

Which level of protein structure describes the coiling or folding of a polypeptide chain into alpha helices and beta pleated sheets?

Accepted Answer

Secondary structure

Answer

Primary structure

Answer

Tertiary structure

Answer

Quaternary structure

Question 6

Which of the following correctly describes the central dogma of molecular biology?

Accepted Answer

DNA → RNA → Protein

Answer

RNA → DNA → Protein

Answer

Protein → RNA → DNA

Answer

DNA → Protein → RNA

Question 7

What is the role of decomposers in an ecosystem?

Accepted Answer

Breaking down dead organic matter and recycling nutrients

Answer

Producing energy from sunlight

Answer

Converting atmospheric nitrogen to usable forms

Answer

Transferring energy from plants to herbivores

Question 8

A mutation that changes a single nucleotide base and results in a different amino acid being inserted is called a:

Accepted Answer

Missense mutation

Answer

Silent mutation

Answer

Frameshift mutation

Answer

Nonsense mutation

Question 9

Which type of organism can perform photosynthesis?

Accepted Answer

Autotrophs

Answer

Heterotrophs

Answer

Decomposers only

Answer

Carnivores

Question 10

Which of the following best defines 'homeostasis'?

Accepted Answer

The maintenance of a stable internal environment despite external changes

Answer

The process of cell division

Answer

The genetic variation within a population

Answer

The storage of energy in chemical bonds