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

Hardy-Weinberg equilibrium requires five conditions: no mutation, no gene flow (migration), random mating, large population, and no natural selection.

Question 2

Which molecule carries amino acids to the ribosome during translation?

Accepted Answer

tRNA

Answer

Transfer RNA (tRNA) has an anticodon that matches mRNA codons and carries the corresponding amino acid to the ribosome for incorporation into the growing protein.

Question 3

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

Accepted Answer

Osmosis

Answer

Osmosis is the passive movement of water across a semipermeable membrane from a region of high water concentration (low solute) to low water concentration (high solute).

Question 4

What is the product of glycolysis?

Accepted Answer

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

Answer

Glycolysis converts one glucose (6-carbon) into two pyruvate (3-carbon) molecules, with a net yield of 2 ATP and 2 NADH.

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

Secondary structure refers to local folding of the polypeptide backbone into alpha helices and beta-pleated sheets, stabilized by hydrogen bonds between backbone atoms.

TEAS Practice Test

TEAS Practice Test

TEAS Science: Biology and Life Science